pull a fast one on vs fox

pull a fast one on is not a noun while fox is a noun.

Word	Noun	Adjective	Verb	Adverb
pull a fast one on	No	No	Yes	No
fox	Yes	No	Yes	No

As verbs, pull a fast one on and fox are synonyms defined as:

Other synonyms of pull a fast one on include flim-flam, fob, play a joke on, play a trick on, play tricks, trick.

pull a fast one on (noun)	fox (noun)
	alert carnivorous mammal with pointed muzzle and ears and a bushy tail; most are predators that do not hunt in packs
	a shifty deceptive person
	the grey or reddish-brown fur of a fox

pull a fast one on (verb)	fox (verb)
deceive somebody	become discolored with, or as if with, mildew spots
	be confusing or perplexing to; cause to be unable to think clearly
	deceive somebody