pick up vs see

pick up is not a noun while see is a noun.

Word	Noun	Adjective	Verb	Adverb
pick up	No	No	Yes	No
see	Yes	No	Yes	No

As verbs, pick up and see are synonyms defined as:

Other synonyms of pick up include discover, find out, get a line, get wind, get word, hear, learn.

pick up (noun)	see (noun)
	the seat within a bishop's diocese where his cathedral is located

pick up (verb)	see (verb)
gain or regain energy	deem to be
improve significantly; go from bad to good	perceive (an idea or situation) mentally
lift out or reflect from a background	get to know or become aware of, usually accidentally
get to know or become aware of, usually accidentally	be careful or certain to do something; make certain of something
eat by pecking at, like a bird	deliberate or decide
take into custody	make sense of; assign a meaning to
take up by hand	find out, learn, or determine with certainty, usually by making an inquiry or other effort
fill with high spirits; fill with optimism	match or meet
give a passenger or a hitchhiker a lift	receive as a specified guest
take and lift upward	imagine; conceive of; see in one's mind
perceive with the senses quickly, suddenly, or momentarily	come together
register (perceptual input)	conduct someone someplace
buy casually or spontaneously	perceive by sight or have the power to perceive by sight
gather or collect	perceive or be contemporaneous with
get in addition, as an increase	see or watch
meet someone for sexual purposes	see and understand, have a good eye
	observe as if with an eye
	undergo or live through a difficult experience
	observe, check out, and look over carefully or inspect
	date regularly; have a steady relationship with
	go to see a place, as for entertainment
	go to see for professional or business reasons
	go to see for a social visit
	take charge of or deal with