dredge up vs refer

dredge up and refer both are verbs.

Word	Noun	Adjective	Verb	Adverb
dredge up	No	No	Yes	No
refer	No	No	Yes	No

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

Other hypernyms of dredge up include advert, bring up, cite, mention, name.

dredge up (verb)	refer (verb)
mention something unpleasant from the past	think of, regard, or classify under a subsuming principle or with a general group or in relation to another
	have as a meaning
	make reference to
	use a name to designate
	seek information from
	send or direct for treatment, information, or a decision
	be relevant to