spade / spayed 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. 👇
spade: (noun) a playing card in the major suit that has one or more black figures on it. (noun) a sturdy hand shovel that can be pushed into the earth with the foot. (verb) dig (up) with a spade.
spayed: (adjective) (of a female animal) having the ovaries removed.
spade: s·p·EY·d
spayed: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)