knock / nock 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. 👇
knock: (noun) the sound of knocking (as on a door or in an engine or bearing). (noun) negative criticism. (noun) a vigorous blow. (noun) a bad experience. (noun) the act of hitting vigorously. (verb) deliver a sharp blow or push :. (verb) rap with the knuckles. (verb) find fault with; express criticism of; point out real or perceived flaws.
nock: NA
knock: n·AA·k
nock: n·AA·k
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)