mechanic vs grease monkey

mechanic and grease monkey both are nouns.

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

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

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

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

mechanic (noun)	grease monkey (noun)
a craftsman skilled in operating machine tools	someone whose occupation is repairing and maintaining automobiles
someone whose occupation is repairing and maintaining automobiles

mechanic (adjective)	grease monkey (adjective)
resembling the action of a machine