inveighed, invade

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

The answer is simple: inveighed, invade are homophones of the English language.

invade
  1. :: verb-transitive

    To enter by force in order to conquer or pillage.

  2. :: verb-transitive

    To encroach or intrude on; violate: "The principal of the trusts could not be invaded without trustee approval” ( Barbara Goldsmith).

  3. :: verb-transitive

    To overrun as if by invading; infest: "About 1917 the shipworm invaded the harbor of San Francisco” ( Rachel Carson).

  4. :: verb-transitive

    To enter and permeate, especially harmfully.

inveighed
  1. :: verb

    Simple past tense and past participle of inveigh.

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