crusader vs meliorist

crusader and meliorist both are nouns.

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

As nouns, crusader and meliorist are synonyms defined as:

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

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