absent vs absence

absent is not a noun while absence is a noun.

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

absent (noun)	absence (noun)
	failure to be present
	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

absent (adjective)	absence (adjective)
not being in a specified place
lost in thought; showing preoccupation
nonexistent

absent (verb)	absence (verb)
stay away or leave