grill / grille 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. 👇
grill: (noun) a framework of metal bars used as a partition or a grate. (verb) cook over a grill. (verb) examine thoroughly.
grille: (noun) grating that admits cooling air to car's radiator.
grill: g·r·IH·l
grille: g·r·IH·l
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)