cod vs pull the leg of

cod is a noun but pull the leg of is not a noun.

Word	Noun	Adjective	Verb	Adverb
cod	Yes	Yes	Yes	No
pull the leg of	No	No	Yes	No

As verbs, pull the leg of is a hyponym of cod; that is, pull the leg of is a word with a more specific, narrower meaning than cod:

Other hyponyms of cod include kid.

cod (noun)	pull the leg of (noun)
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)

cod (adjective)	pull the leg of (adjective)
payable by the recipient on delivery

cod (verb)	pull the leg of (verb)
harass with persistent criticism or carping	tell false information to for fun
fool or hoax