automobile mechanic vs grease monkey

automobile mechanic and grease monkey both are nouns.

Word	Noun	Adjective	Verb	Adverb
automobile mechanic	Yes	No	No	No
grease monkey	Yes	No	No	No

As nouns, automobile mechanic and grease monkey are synonyms defined as:

automobile mechanic and grease monkey: someone whose occupation is repairing and maintaining automobiles

Other synonyms of automobile mechanic include auto-mechanic, car-mechanic, mechanic.

automobile mechanic (noun)	grease monkey (noun)
someone whose occupation is repairing and maintaining automobiles	someone whose occupation is repairing and maintaining automobiles