microcircuit vs micro chip

microcircuit and micro chip both are nouns.

Word	Noun	Adjective	Verb	Adverb
microcircuit	Yes	No	No	No
micro chip	Yes	No	No	No

microcircuit (noun)	micro chip (noun)
a microelectronic computer circuit incorporated into a chip or semiconductor; a whole system rather than a single component	electronic equipment consisting of a small crystal of a silicon semiconductor fabricated to carry out a number of electronic functions in an integrated circuit