knight / night 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. 👇
knight: (noun) originally a person of noble birth trained to arms and chivalry; today in Great Britain a person honored by the sovereign for personal merit. (noun) a chessman shaped to resemble the head of a horse; can move two squares horizontally and one vertically (or vice versa). (verb) raise (someone) to knighthood.
night: (noun) the time after sunset and before sunrise while it is dark outside. (noun) a period of ignorance or backwardness or gloom. (noun) the period spent sleeping. (noun) the dark part of the diurnal cycle considered a time unit. (noun) darkness. (noun) a shortening of nightfall. (noun) the time between sunset and midnight.
knight: n·AY·t
night: n·AY·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)