homeboy vs fellow member

homeboy and fellow member both are nouns.

Word	Noun	Adjective	Verb	Adverb
homeboy	Yes	No	No	No
fellow member	Yes	No	No	No

As nouns, fellow member is a hypernym of homeboy; that is, fellow member is a word with a broader meaning than homeboy:

homeboy: a fellow male member of a youth gang
fellow member: one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)

Other hypernyms of homeboy include member.

homeboy (noun)	fellow member (noun)
a male friend from your neighborhood or hometown	one of the persons who compose a social group (especially individuals who have joined and participate in a group organization)
a fellow male member of a youth gang