junky vs enthusiast

junky and enthusiast both are nouns.

Word	Noun	Adjective	Verb	Adverb
junky	Yes	No	No	No
enthusiast	Yes	No	No	No

As nouns, enthusiast is a hypernym of junky; that is, enthusiast is a word with a broader meaning than junky:

junky: someone who is so ardently devoted to something that it resembles an addiction
enthusiast: an ardent and enthusiastic supporter of some person or activity

Other hypernyms of junky include partisan, partizan.

junky (noun)	enthusiast (noun)
a narcotics addict	an ardent and enthusiastic supporter of some person or activity
someone who is so ardently devoted to something that it resembles an addiction	a person having a strong liking for something