Synonyms for C-note:

n.

five, fiver, fin, buck, the grey pound, the gray dollar, five-spot, greenback, grand. •c-note (noun)
hundred dollar bill.
•possession (noun)
hundred dollar bill.

Other synonyms:

greenback, five-spot, fiver. five. fin. buck, grand. •Other relevant words:
grand, greenback, fiver, buck, fin, five.