chain gang vs gang

chain gang and gang both are nouns.

Word	Noun	Adjective	Verb	Adverb
chain gang	Yes	No	No	No
gang	Yes	No	Yes	No

As nouns, gang is a hypernym of chain gang; that is, gang is a word with a broader meaning than chain gang:

Other hypernyms of chain gang include crew, work party.

chain gang (noun)	gang (noun)
a gang of convicts chained together	tool consisting of a combination of implements arranged to work together
	an organized group of workmen
	an association of criminals
	an informal body of friends

chain gang (verb)	gang (verb)
	act as an organized group