knot / not 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. 👇
knot: (noun) a tight cluster of people or things. (noun) any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object. (noun) a hard cross-grained round piece of wood in a board where a branch emerged. (noun) something twisted and tight and swollen. (noun) a sandpiper that breeds in the Arctic and winters in the southern hemisphere. (verb) make into knots; make knots out of. (verb) tie or fasten into a knot.
not: (adverb) negation of a word or group of words.
knot: n·AA·t
not: n·AA·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)