absence vs absenteeism

absence and absenteeism both are nouns.

Word	Noun	Adjective	Verb	Adverb
absence	Yes	No	No	No
absenteeism	Yes	No	No	No

As nouns, absenteeism is a hyponym of absence; that is, absenteeism is a word with a more specific, narrower meaning than absence:

Other hyponyms of absence include cut, default.

absence (noun)	absenteeism (noun)
failure to be present	habitual absence from work
the state of being absent
the occurrence of an abrupt, transient loss or impairment of consciousness (which is not subsequently remembered), sometimes with light twitching, fluttering eyelids, etc.; common in petit mal epilepsy
the time interval during which something or somebody is away