hear vs pick up

hear and pick up both are verbs.

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

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

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

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

Other hypernyms of hear include receive.

hear (verb)	pick up (verb)
get to know or become aware of, usually accidentally	gain or regain energy
perceive (sound) via the auditory sense	improve significantly; go from bad to good
receive a communication from someone	lift out or reflect from a background
listen and pay attention	get to know or become aware of, usually accidentally
examine or hear (evidence or a case) by judicial process	eat by pecking at, like a bird
	take into custody
	take up by hand
	fill with high spirits; fill with optimism
	give a passenger or a hitchhiker a lift
	take and lift upward
	perceive with the senses quickly, suddenly, or momentarily
	register (perceptual input)
	buy casually or spontaneously
	gather or collect
	get in addition, as an increase
	meet someone for sexual purposes