deviser, devisor, divisor

The words deviser, devisor, divisor sound the same but have different meanings and spellings. Why do deviser, devisor, divisor sound the same even though they are completely different words?

The answer is simple: deviser, devisor, divisor are homophones of the English language.

deviser
  1. :: noun

    A person who devises; a planner.

devisor
  1. :: noun

    Law One that makes a devise.

divisor
  1. :: noun

    The quantity by which another quantity, the dividend, is to be divided.

Definitions from Wiktionary, Creative Commons Attribution/Share-Alike License, from The American Heritage® Dictionary of the English Language, 4th Edition and Wordnik.

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About Homophones

Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.

If they are spelled the same then they are also homographs (and homonyms); if they are spelled differently then they are also heterographs (literally "different writing").