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