HETERONYMS... spelled identically but have different meanings when pronounced differently.	Heteronym homepage
HOMOGRAPHS...  identical spellings but different pronunciations and different meanings.	The Homography Page
HOMONYMS  pronounced the same, but are spelled differently, and that have different meanings.	Homonyms (Alan Cooper)
ANTONYMS words that have opposite meanings	Antonym finder Antonym on-line activity Matching exercise with antonyms
SYNONYMS words that have the same, or almost the same meaning.	English synonym dictionary Synonym crossword puzzle
ANTAGONYMS a single word that has meanings that contradict each other	Antagonyms List of specific words and meanings i.e.Cut: get in (as in line or queue) vs. get out (as in a school class)