incidence / incidents 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. 👇
incidence: (noun) the relative frequency of occurrence of something. (noun) the striking of a light beam on a surface.
incidents: (noun) a single distinct event. (noun) a public disturbance.
incidence: IH·n·s·ah·d·ah·n·s
incidents: IH·n·s·ah·d·ah·n·t·s
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)