pick up vs hear

pick up and hear both are verbs.

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

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

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

As verbs, hear is a hyponym of pick up; that is, hear is a word with a more specific, narrower meaning than pick up:

pick up (verb)	hear (verb)
gain or regain energy	get to know or become aware of, usually accidentally
improve significantly; go from bad to good	perceive (sound) via the auditory sense
lift out or reflect from a background	receive a communication from someone
get to know or become aware of, usually accidentally	listen and pay attention
eat by pecking at, like a bird	examine or hear (evidence or a case) by judicial process
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