intermittency vs unregularity

intermittency and unregularity both are nouns.

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

As nouns, unregularity is a hypernym of intermittency; that is, unregularity is a word with a broader meaning than intermittency:

intermittency: the quality of being intermittent; subject to interruption or periodic stopping
unregularity: not characterized by a fixed principle or rate; at irregular intervals

Other hypernyms of intermittency include irregularity.

intermittency (noun)	unregularity (noun)
the quality of being intermittent; subject to interruption or periodic stopping	not characterized by a fixed principle or rate; at irregular intervals