The words accede, axseed sound the same but have different meanings and spellings. Why do accede, axseed sound the same even though they are completely different words?
The answer is simple: accede, axseed are homophones of the English language.
To give one's consent, often at the insistence of another; concede. See Synonyms at assent.
To arrive at or come into an office or dignity: accede to the throne.
To become a party to an agreement or treaty.
Same as axfitch.
Definitions from The American Heritage® Dictionary of the English Language, 4th Edition, from The Century Dictionary and Cyclopedia and Wordnik.
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").