1. a word that is pronounced like another but has a different meaning and often different spelling
homonym
2. a mark placed over a letter to show its pronunciation
diacritical mark
3. a word that has the same or nearly the same meaning as another word
antonym
4. a word that means the opposite of another word
synonym
5. shortened form of a word or phrase
pronunciation
6. the act or manner of sounding words
abbreviation