The words pores, pours sound the same but have different meanings and spellings. Why do pores, pours sound the same even though they are completely different words?
The answer is simple: pores, pours are homophones of the English language.
Plural form of pore.
Third-person singular simple present indicative form of pore.
Third-person singular simple present indicative form of pour.
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.