knar, gnar

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

The answer is simple: knar, gnar are homophones of the English language.

gnar
  1. :: verb-intransitive

    To snarl; growl.

knar
  1. :: noun

    A knot or burl on a tree or in wood.

Definitions 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").