understate vs sandbag

understate is not a noun while sandbag is a noun.

Word	Noun	Adjective	Verb	Adverb
understate	No	No	Yes	No
sandbag	Yes	No	Yes	No

understate (noun)	sandbag (noun)
	a bag filled with sand; used as a weapon or to build walls or as ballast

understate (verb)	sandbag (verb)
represent as less significant or important	protect or strengthen with sandbags; stop up
	downplay one's ability (towards others) in a game in order to deceive, as in gambling
	hit something or somebody as if with a sandbag
	treat harshly or unfairly
	compel by coercion, threats, or crude means