libber vs meliorist

libber and meliorist both are nouns.

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

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

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

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