coy / koi 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. 👇
coy: (adjective) affectedly modest or shy especially in a playful or provocative way. (adjective) showing marked and often playful or irritating evasiveness or reluctance to make a definite or committing statement. (adjective) modestly or warily rejecting approaches or overtures.
koi: NA
coy: k·OY
koi: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)