ceding, seeding

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

The answer is simple: ceding, seeding are homophones of the English language.

ceding
  1. :: verb

    Present participle of cede.

seeding
  1. :: verb

    Present participle of seed.

  2. :: noun

    The arrangement of positions in a tournament

Definitions 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").