pleas / please 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. 👇
pleas: (noun) (law) a defendant's answer by a factual matter (as distinguished from a demurrer). (noun) an answer indicating why a suit should be dismissed.
please: (verb) give pleasure to or be pleasing to. (verb) be the will of or have the will (to). (verb) give satisfaction. (adverb) used in polite request.
pleas: p·l·IY·z
please: p·l·IY·z
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)