grease monkey vs automobile mechanic

grease monkey and automobile mechanic both are nouns.

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

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

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

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

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