ground-service crew vs ground crew

ground-service crew and ground crew both are nouns.

Word	Noun	Adjective	Verb	Adverb
ground-service crew	Yes	No	No	No
ground crew	Yes	No	No	No

As nouns, ground-service crew and ground crew are synonyms defined as:

ground-service crew and ground crew: the crew of technicians and mechanics who service aircraft on the ground

ground-service crew (noun)	ground crew (noun)
the crew of technicians and mechanics who service aircraft on the ground	the crew of technicians and mechanics who service aircraft on the ground