flour vs dredge

flour and dredge both are nouns.

Word	Noun	Adjective	Verb	Adverb
flour	Yes	No	Yes	No
dredge	Yes	No	Yes	No

As verbs, dredge is a hypernym of flour; that is, dredge is a word with a broader meaning than flour:

flour (noun)	dredge (noun)
fine powdery foodstuff obtained by grinding and sifting the meal of a cereal grain	a power shovel to remove material from a channel or riverbed

flour (verb)	dredge (verb)
convert grain into flour	remove with a power shovel, usually from a bottom of a body of water
cover with flour	search (as the bottom of a body of water) for something valuable or lost
	cover before cooking