absence vs awayness

absence and awayness both are nouns.

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

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

Other hyponyms of absence include nonoccurrence.

absence (noun)	awayness (noun)
failure to be present	the state of being elsewhere than in particular place
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