mic vs crystal mike

mic and crystal mike both are nouns.

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

As nouns, crystal mike is a hyponym of mic; that is, crystal mike is a word with a more specific, narrower meaning than mic:

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

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