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