antonym
antonym (antónimo)
a word that means the opposite of another word, often used as a contrast clue.
Example
Unlike his generous brother, Paul was stingy. (Generous and stingy are antonyms.)
In Spanish
antonym (antónimo) — una palabra que significa lo contrario de otra; a menudo sirve como pista de contraste.
Unlike his generous brother, Paul was stingy. (Generous y stingy son antónimos.)