Mc vs megacycle

Mc and megacycle both are nouns.

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

As nouns, Mc and megacycle are synonyms defined as:

Other synonyms of Mc include megacycle per second, megahertz, MHz.

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