intermittency vs intermittence

intermittency and intermittence both are nouns.

Word	Noun	Adjective	Verb	Adverb
intermittency	Yes	No	No	No
intermittence	Yes	No	No	No

As nouns, intermittency and intermittence are synonyms defined as:

intermittency and intermittence: the quality of being intermittent; subject to interruption or periodic stopping

intermittency (noun)	intermittence (noun)
the quality of being intermittent; subject to interruption or periodic stopping	the quality of being intermittent; subject to interruption or periodic stopping