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. difficult to describe, rarely seen

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n. an object or a representation that functions as a symbol

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v. imply or require; cause to ensue or accrue; cut or carve in ornamental way

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n. any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions

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n. passage or segment taken from a longer work, such as literary or musical composition

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v. cause to feel happily refreshed and energetic; fill with emotion

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v. help bring about; make less difficult

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a. difficult to please; having complicated requirements; excessively particular demanding about details

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a. capable of being accomplished or brought about