attendance vs oftenness

attendance and oftenness both are nouns.

Word	Noun	Adjective	Verb	Adverb
attendance	Yes	No	No	No
oftenness	Yes	No	No	No

As nouns, oftenness is a hypernym of attendance; that is, oftenness is a word with a broader meaning than attendance:

Other hypernyms of attendance include frequence, frequency.

attendance (noun)	oftenness (noun)
the act of being present (at a meeting or event etc.)	the number of occurrences within a given time period
the number of people that are present
the frequency with which a person is present