Inventions That Changed Everything: 15 IELTS Words from Band 6 to Band 8

Fifteen words drawn from the theme of inventions that changed everything, grouped by the band they belong to. Each one comes with a definition, a sentence showing it at work, and the mistake examiners see most often.

Band 6 words

Five words at band 6.

• cooperate (verb) — To work together with others to achieve a common goal

  Countries must cooperate to address global challenges.

  Watch out: "Cooperate with" someone. "Cooperation" (noun), "cooperative" (adjective).

  Common pairings: cooperate with, international cooperation, cooperative effort, cooperate closely

• select (verb) — To carefully choose someone or something from a group

  Participants were selected based on their age, gender, and educational background.

  Watch out: "Select" implies careful choice from options. "Choose" is more general. "Pick" is informal.

  Common pairings: carefully select, randomly selected, selection criteria, selection process

• injure (verb) — To cause physical harm or damage to someone or something

  Workplace accidents injure thousands of workers every year.

  Watch out: "Injure" is for physical harm. "Hurt" is broader and includes feelings. "Wound" suggests serious injury.

  Common pairings: seriously injured, injure yourself, badly injured, injured party

• consistent (adjective) — Always behaving or happening in the same way; not changing

  The results were consistent across all three studies conducted in different countries.

  Watch out: "Consistent with" means agreeing with. "Consistent" alone means unchanging. They have different uses.

  Common pairings: consistent with, consistent growth, remain consistent, consistent pattern

• assumption (noun) — Something accepted as true without proof

  The assumption that technology always improves life is not always correct.

  Watch out: "Assumption" = belief without proof. "Assume" = to believe/suppose.

  Common pairings: make an assumption, based on the assumption, underlying assumption, false assumption

Band 7 words

Five words at band 7.

• convert (verb) — To change something into a different form, character, or function; to change from one system to another.

  Many countries are working to convert their energy systems from fossil fuels to renewables.

  Watch out: Using 'convert' and 'transform' interchangeably. Convert usually involves a specific change in form; transform implies a more dramatic change.

  Common pairings: convert into, convert to, conversion rate, convert data

• comparable (adjective) — Able to be compared; similar in quality or degree

  The results are comparable to those of previous studies.

  Watch out: "Comparable to" not "comparable with" (though both are used).

  Common pairings: comparable to, comparable in, not comparable, directly comparable

• domestic (adjective) — Relating to the home or family; existing within one country rather than international

  Domestic consumption accounts for 60% of the country's energy use.

  Watch out: "Domestic" can mean home-related (domestic chores) or national (domestic policy). Context determines meaning.

  Common pairings: domestic market, domestic policy, domestic consumption, domestic violence

• apparatus (noun) — Equipment or machinery for a particular activity

  The laboratory has state-of-the-art scientific apparatus.

  Watch out: "Apparatus" = equipment. Also: organizational structure ("state apparatus").

  Common pairings: scientific apparatus, state apparatus, administrative apparatus, complex apparatus

expand (verb) — To become larger or more extensive; to increase in size, number, or importance

The company plans to expand its operations into Asian markets.

Watch out: "Expand" means to grow outward. "Extend" means to make longer. They are different types of growth.

Common pairings: expand rapidly, expand into, expand operations, expand knowledge

Band 8 words

Five words at band 8.

• outsource (verb) — To obtain goods or services from an outside supplier

  Many companies outsource manufacturing to countries with lower labor costs.

  Watch out: "Outsource" = get from outside. "Offshore" = specifically moving abroad. Related but different.

  Common pairings: outsource production, outsource services, outsource jobs, outsource to

• initiative (noun) — A new plan or process to achieve something or solve a problem; the ability to act independently.

  The government has launched several initiatives to promote renewable energy adoption.

  Watch out: Initiative as a quality means self-motivation. As a plan, it means a new programme or scheme.

  Common pairings: take the initiative, government initiative, launch an initiative, new initiatives

• foundation (noun) — The underlying basis or principle; the base on which something is built

  A solid foundation in mathematics is essential for studying science.

  Watch out: "Foundation" is the base. "Basis" is the underlying reason. "Fundamental" is an adjective. Know the differences.

  Common pairings: solid foundation, lay the foundation, foundation for, without foundation

• accumulate (verb) — To gradually gather or acquire an increasing amount of something

  Wealth tends to accumulate in the hands of a small percentage of the population.

  Watch out: "Accumulate" suggests gradual increase over time. "Collect" is more deliberate. "Gather" can be quick.

  Common pairings: accumulate wealth, accumulate evidence, accumulate over time, gradually accumulate

• vocational (adjective) — Relating to education or training for a specific job or career

  Vocational training provides practical skills for specific industries.

  Watch out: "Vocational" = job-focused training. "Academic" = theoretical knowledge. Different paths.

  Common pairings: vocational training, vocational education, vocational skills, vocational courses

Mistakes to avoid

• Incorrect use of "foundation"

  Correct usage: "foundation" - the underlying basis or principle; the base on which something is built

  "Foundation" is the base. "Basis" is the underlying reason. "Fundamental" is an adjective. Know the differences.

• Incorrect use of "assumption"

  Correct usage: "assumption" - something accepted as true without proof

  "Assumption" = belief without proof. "Assume" = to believe/suppose.

• Incorrect use of "initiative"

  Correct usage: "initiative" - a new plan or process to achieve something or solve a problem; the ability to act independently.

  Initiative as a quality means self-motivation. As a plan, it means a new programme or scheme.

Practise the words

Fill each gap, then check yourself against the answers underneath.

1. Participants were selected based on their age, gender, and educational background.
2. The company plans to _______ its operations into Asian markets.
3. The results were _______ across all three studies conducted in different countries.
4. A solid _______ in mathematics is essential for studying science.
5. Workplace accidents _______ thousands of workers every year.

Answers: select, expand, consistent, foundation, injure

Writing tip

Check your work for common errors: articles, subject-verb agreement, tenses.