pleural / plural 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. 👇
pleural: (adjective) of or relating to the pleura or the walls of the thorax.
plural: (noun) the form of a word that is used to denote more than one. (adjective) composed of more than one member, set, or kind. (adjective) grammatical number category referring to two or more items or units.
pleural: NA
plural: p·l·UH·r·ah·l
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)