crystal microphone vs mic

crystal microphone and mic both are nouns.

Word	Noun	Adjective	Verb	Adverb
crystal microphone	Yes	No	No	No
mic	Yes	No	No	No

As nouns, mic is a hypernym of crystal microphone; that is, mic is a word with a broader meaning than crystal microphone:

crystal microphone: a microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage
mic: device for converting sound waves into electrical energy

Other hypernyms of crystal microphone include microphone, mike.

crystal microphone (noun)	mic (noun)
a microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage	device for converting sound waves into electrical energy