frequent vs frequence

frequent is not a noun while frequence is a noun.

Word	Noun	Adjective	Verb	Adverb
frequent	No	Yes	Yes	No
frequence	Yes	No	No	No

frequent (noun)	frequence (noun)
	the number of occurrences within a given time period

frequent (adjective)	frequence (adjective)
coming at short intervals or habitually
frequently encountered

frequent (verb)	frequence (verb)
be a regular or frequent visitor to a certain place
do one's shopping at; do business with; be a customer or client of