The words floured, flowered sound the same but have different meanings and spellings. Why do floured, flowered sound the same even though they are completely different words?
The answer is simple: floured, flowered are homophones of the English language.
Simple past tense and past participle of flour.
That has produced flowers.
Decorated with flowers, or images of flowers.
Simple past tense and past participle of flower.
Definitions from Wiktionary, Creative Commons Attribution/Share-Alike License and Wordnik.
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.