mewl / mule 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. 👇
mewl: NA
mule: (noun) hybrid offspring of a male donkey and a female horse; usually sterile. (noun) a slipper that has no fitting around the heel.
mewl: NA
mule: m·y·UW·l
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)