automobile mechanic vs car-mechanic

automobile mechanic and car-mechanic both are nouns.

Word	Noun	Adjective	Verb	Adverb
automobile mechanic	Yes	No	No	No
car-mechanic	Yes	No	No	No

As nouns, automobile mechanic and car-mechanic are synonyms defined as:

automobile mechanic and car-mechanic: someone whose occupation is repairing and maintaining automobiles

Other synonyms of automobile mechanic include auto-mechanic, grease monkey, mechanic.

automobile mechanic (noun)	car-mechanic (noun)
someone whose occupation is repairing and maintaining automobiles	someone whose occupation is repairing and maintaining automobiles