near-antonym

noun1

1. •
   A word that is nearly an antonym, when an antonym is defined strictly by complete negation or polar oppositeness. (Many reference works use a looser definition of antonym that lumps these words into the single category of antonyms; some make the more rigorous distinction.)

   • Among the most common antonyms or near antonyms are the following. Make sure that you know their meanings. — 1978