ceil / seal / seel 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. 👇
ceil: NA
seal: (noun) a device incised to make an impression; used to secure a closing or to authenticate documents. (noun) the pelt or fur (especially the underfur) of a seal. (noun) a stamp affixed to a document (as to attest to its authenticity or to seal it). (noun) a finishing coat applied to exclude moisture. (noun) fastener that provides a tight and perfect closure. (noun) any of numerous marine mammals that come on shore to breed; chiefly of cold regions. (verb) make tight; secure against leakage. (verb) close with or as if with a seal. (verb) decide irrevocably. (verb) affix a seal to. (verb) hunt seals.
seel: (verb) sew up the eyelids of hawks and falcons.
ceil: NA
seal: s·IY·l
seel: s·IY·l
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)