devotee vs groupie

devotee and groupie both are nouns.

Word	Noun	Adjective	Verb	Adverb
devotee	Yes	No	No	No
groupie	Yes	No	No	No

As nouns, groupie is a hyponym of devotee; that is, groupie is a word with a more specific, narrower meaning than devotee:

devotee: an ardent follower and admirer
groupie: an enthusiastic young fan (especially a young woman who follows rock groups around)

devotee (noun)	groupie (noun)
an ardent follower and admirer	an enthusiastic young fan (especially a young woman who follows rock groups around)