dredge vs shovel

dredge and shovel both are nouns.

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

As nouns, shovel is a hypernym of dredge; that is, shovel is a word with a broader meaning than dredge:

Other hypernyms of dredge include digger, excavator, power shovel.

dredge (noun)	shovel (noun)
a power shovel to remove material from a channel or riverbed	a hand tool for lifting loose material; consists of a curved container or scoop and a handle
	a fire iron consisting of a small shovel used to scoop coals or ashes in a fireplace
	a machine for excavating
	the quantity a shovel can hold

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