apatite / appetite 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. 👇
apatite: (noun) a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus.
appetite: (noun) a feeling of craving something; ; - Granville Hicks.
apatite: AE·p·ah·t·AY·t
appetite: AE·p·ah·t·AY·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)