bullfighter vs picador

bullfighter and picador both are nouns.

Word	Noun	Adjective	Verb	Adverb
bullfighter	Yes	No	No	No
picador	Yes	No	No	No

As nouns, picador is a hyponym of bullfighter; that is, picador is a word with a more specific, narrower meaning than bullfighter:

bullfighter: someone who fights bulls
picador: the horseman who pricks the bull with a lance early in the bullfight to goad the bull and to make it keep its head low

Other hyponyms of bullfighter include banderillero, matador, novillero, torero.

bullfighter (noun)	picador (noun)
someone who fights bulls	the horseman who pricks the bull with a lance early in the bullfight to goad the bull and to make it keep its head low