gang vs road gang

gang and road gang both are nouns.

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

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

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

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