warrior vs Crusader

warrior and Crusader both are nouns.

Word	Noun	Adjective	Verb	Adverb
warrior	Yes	No	No	No
Crusader	Yes	No	No	No

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

Other hyponyms of warrior include brave, centurion, guerilla, guerrilla, insurgent, irregular, samurai.

warrior (noun)	Crusader (noun)
someone engaged in or experienced in warfare	a warrior who engages in a holy war