Here are some possibilities:
* Antonym: This is the most likely option. Antonyms are words with opposite meanings, like "hot" and "cold", or "happy" and "sad".
* Synonym: This refers to words that have the same or nearly the same meaning, like "happy" and "joyful".
* Homonym: These are words that sound the same but have different meanings and spellings, like "to, too, and two".
* Heteronym: This refers to words that are spelled the same but have different pronunciations and meanings, like "bow (to bend) and bow (a weapon)".
If you can provide more context or examples, I might be able to understand what you're looking for and offer a better answer.