cellar / seller 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. 👇
cellar: (noun) storage space where wines are stored.
seller: (noun) someone who promotes or exchanges goods or services for money.
cellar: s·EH·l·er
seller: s·EH·l·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)