grease monkey vs auto-mechanic

grease monkey and auto-mechanic both are nouns.

Word	Noun	Adjective	Verb	Adverb
grease monkey	Yes	No	No	No
auto-mechanic	Yes	No	No	No

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

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

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

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