homographs: Homographs are words which have the same spelling, although are different in either meaning, derivation or pronunciation. E.g. "boot" can mean an item of shoe-wear, or it can mean "to kick".
lexeme: The head word form that one would look up for if one were looking for the word in the dictionary. For example, the forms kicks, kicked and kicking would all be reduced to the lexeme KICK. These variants form the lemma of the lexeme KICK.
part-of-speech: A way of describing a lexical item in grammatical terms, e.g. singular common noun, comparative adjective, past participle.)