fraternity vs guild

fraternity and guild both are nouns.

Word	Noun	Adjective	Verb	Adverb
fraternity	Yes	No	No	No
guild	Yes	No	No	No

As nouns, guild is a hypernym of fraternity; that is, guild is a word with a broader meaning than fraternity:

Other hypernyms of fraternity include club, gild, lodge, order, social club, society.

fraternity (noun)	guild (noun)
people engaged in a particular occupation	a formal association of people with similar interests
a social club for male undergraduates