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