first gear vs automobile

first gear and automobile both are nouns.

Word	Noun	Adjective	Verb	Adverb
first gear	Yes	No	No	No
automobile	Yes	No	Yes	No

first gear (noun)	automobile (noun)
the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving	a motor vehicle with four wheels; usually propelled by an internal combustion engine

first gear (verb)	automobile (verb)
	travel in an automobile