Words that are opposite in meaning to others (8)

I believe the answer is:

antonyms

(Other definitions for antonyms that I've seen before include "'Good' and 'bad' are examples" , "My son, Nat, turns to words which are opposite in meaning" , "sickness and health for example" , "They are opposed" , "Words with opposite meanings" .)

I've seen this clue in The Irish Times.

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