tenner / tenor 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. 👇
tenner: (noun) a United States bill worth 10 dollars.
tenor: (noun) the adult male singing voice above baritone. (noun) the pitch range of the highest male voice. (noun) an adult male with a tenor voice. (noun) a settled or prevailing or habitual course of a person's life. (noun) the general meaning or substance of an utterance. (adjective) (of a musical instrument) intermediate between alto and baritone or bass. (adjective) of or close in range to the highest natural adult male voice.
tenner: t·EH·n·er
tenor: t·EH·n·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)