dredge vs look for

dredge is a noun but look for is not a noun.

Word	Noun	Adjective	Verb	Adverb
dredge	Yes	No	Yes	No
look for	No	No	Yes	No

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

dredge: search (as the bottom of a body of water) for something valuable or lost
look for: try to locate or discover, or try to establish the existence of

Other hypernyms of dredge include search, seek.

dredge (noun)	look for (noun)
a power shovel to remove material from a channel or riverbed

dredge (verb)	look for (verb)
remove with a power shovel, usually from a bottom of a body of water	try to locate or discover, or try to establish the existence of
search (as the bottom of a body of water) for something valuable or lost	be excited or anxious about
cover before cooking