plectron vs guitar pick

plectron and guitar pick both are nouns.

Word	Noun	Adjective	Verb	Adverb
plectron	Yes	No	No	No
guitar pick	Yes	No	No	No

As nouns, guitar pick is a hyponym of plectron; that is, guitar pick is a word with a more specific, narrower meaning than plectron:

plectron: a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument
guitar pick: a plectrum used to pluck a guitar

plectron (noun)	guitar pick (noun)
a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument	a plectrum used to pluck a guitar