tailgate vs waggon

tailgate and waggon both are nouns.

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

tailgate (noun)	waggon (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

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