bloc / block 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. 👇
bloc: (noun) a group of countries in special alliance.
block: (noun) a solid piece of something (usually having flat rectangular sides). (noun) a rectangular area in a city surrounded by streets and usually containing several buildings. (noun) a three-dimensional shape with six square or rectangular sides. (noun) a number or quantity of related things dealt with as a unit. (noun) housing in a large building that is divided into separate units. (noun) (computer science) a sector or group of sectors that function as the smallest data unit permitted. (noun) an inability to remember or think of something you normally can do; often caused by emotional tension. (verb) run on a block system. (verb) interrupt the normal function of by means of anesthesia. (verb) stamp or emboss a title or design on a book with a block. (verb) support, secure, or raise with a block. (verb) shape by using a block. (verb) shape into a block or blocks.
bloc: b·l·AA·k
block: b·l·AA·k
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)