car-mechanic vs grease monkey

car-mechanic and grease monkey both are nouns.

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

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

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

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

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