crystal vs crystal microphone

crystal and crystal microphone both are nouns.

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

crystal (noun)	crystal microphone (noun)
a protective cover that protects the face of a watch	a microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage
glassware made of quartz
a crystalline element used as a component in various electronic devices
a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
a solid formed by the solidification of a chemical and having a highly regular atomic structure
colorless glass made of almost pure silica