Mc vs megacycle per second

Mc and megacycle per second both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mc	Yes	No	No	No
megacycle per second	Yes	No	No	No

As nouns, Mc and megacycle per second are synonyms defined as:

Other synonyms of Mc include megacycle, megahertz, MHz.

Mc (noun)	megacycle per second (noun)
one million periods per second	one million periods per second