meliorist vs crusader

meliorist and crusader both are nouns.

Word	Noun	Adjective	Verb	Adverb
meliorist	Yes	No	No	No
crusader	Yes	No	No	No

As nouns, meliorist and crusader are synonyms defined as:

Other synonyms of meliorist include reformer, reformist, social reformer.

meliorist (noun)	crusader (noun)
a disputant who advocates reform	a disputant who advocates reform