pomace / pumice 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. 👇
pomace: NA
pumice: (noun) a light glass formed on the surface of some lavas; used as an abrasive. (verb) rub with pumice, in order to clean or to smoothen.
pomace: NA
pumice: p·AH·m·ah·s
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)