absence / absents are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
absence: (noun) the state of being absent. (noun) failure to be present. (noun) the time interval during which something or somebody is away. (noun) 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.
absents: (verb) go away or leave.
absence: AE·b·s·ah·n·s
absents: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)