Difficult IELTS Words - Group 4

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n. an ecological community together with its environment, a system formed by interactions of components with their environments

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a. symbolic; relating to, or serving as an emblem

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v. remove from one country or State to another, for the purpose of residence; migrate from home

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v. give off; send out; give out as sound

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a. derived from experiment and observation rather than theory

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a. active; brisk; vigorous

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v. insert in a roil; register or enter in list or catalogue; insert in records; enlist

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n. corrosion; a gradual decline of something

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n. a set of principles of right conduct; theory or a system of moral values

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v. make worse; irritate; make very angry or impatient; annoy greatly