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An antonym is an opposite, and while reptiles and amphibians are very different they can't be considered opposites because not every aspect of them are opposites. For example, there are both reptiles and amphibians that lay eggs.

Generally, there are no antonyms for nouns (objects/organisms).

Antonyms are most often used with adjectives, adverbs and verbs. Ex: dirty/clean

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13y ago

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