tailgate vs wagon

tailgate and wagon both are nouns.

Word	Noun	Adjective	Verb	Adverb
tailgate	Yes	No	Yes	No
wagon	Yes	No	No	No

tailgate (noun)	wagon (noun)
a gate at the rear of a vehicle; can be lowered for loading	any of various kinds of wheeled vehicles drawn by an animal or a tractor
	a car that has a long body and rear door with space behind rear seat
	van used by police to transport prisoners
	a child's four-wheeled toy cart sometimes used for coasting

tailgate (verb)	wagon (verb)
follow at a dangerously close distance