filet / fillet 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. 👇
filet: (noun) lace having a square mesh.
fillet: (noun) a boneless steak cut from the tenderloin of beef. (noun) a longitudinal slice or boned side of a fish. (noun) fastener consisting of a narrow strip of welded metal used to join steel members. (verb) decorate with a lace of geometric designs. (verb) cut into filets.
filet: f·ih·l·EY
fillet: f·ah·l·EY
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)