underrun vs cart

underrun is not a noun while cart is a noun.

Word	Noun	Adjective	Verb	Adverb
underrun	No	No	Yes	No
cart	Yes	No	Yes	No

As verbs, cart is a hypernym of underrun; that is, cart is a word with a broader meaning than underrun:

Other hypernyms of underrun include drag, hale, haul.

underrun (noun)	cart (noun)
	a heavy open wagon usually having two wheels and drawn by an animal
	wheeled vehicle that can be pushed by a person; may have one or two or four wheels

underrun (verb)	cart (verb)
haul onto a boat	draw slowly or heavily
run or pass below	transport something in a cart