libber vs crusader

libber and crusader both are nouns.

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

As nouns, crusader is a hypernym of libber; that is, crusader is a word with a broader meaning than libber:

Other hypernyms of libber include meliorist, reformer, reformist, social reformer.

libber (noun)	crusader (noun)
a supporter of feminism	a disputant who advocates reform