codling vs cod

codling and cod both are nouns.

Word	Noun	Adjective	Verb	Adverb
codling	Yes	No	No	No
cod	Yes	Yes	Yes	No

As nouns, cod is a hypernym of codling; that is, cod is a word with a broader meaning than codling:

Other hypernyms of codling include codfish.

codling (noun)	cod (noun)
young codfish	major food fish of Arctic and cold-temperate waters
	lean white flesh of important North Atlantic food fish; usually baked or poached
	the vessel that contains the seeds of a plant (not the seeds themselves)

codling (adjective)	cod (adjective)
	payable by the recipient on delivery

codling (verb)	cod (verb)
	harass with persistent criticism or carping
	fool or hoax