beetle / betel 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. 👇
beetle: (noun) insect having biting mouthparts and front wings modified to form horny covers overlying the membranous rear wings. (verb) fly or go in a manner resembling a beetle. (verb) beat with a beetle. (adjective) jutting or overhanging.
betel: (noun) Asian pepper plant whose dried leaves are chewed with betel nut (seed of the betel palm) by southeast Asians.
beetle: b·IY·t·ah·l
betel: b·EH·t·ah·l
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)