The words saver, savor sound the same but have different meanings and spellings. Why do saver, savor sound the same even though they are completely different words?
The answer is simple: saver, savor are homophones of the English language.
One who saves.
one who keeps savings more than usual.
The taste or smell of something.
A specific taste or smell. See Synonyms at taste.
A distinctive quality or sensation: enjoying the savor of victory.
To have a particular taste or smell: a dish that savors of curry.
Definitions from Wiktionary, Creative Commons Attribution/Share-Alike License, from The American Heritage® Dictionary of the English Language, 4th Edition and Wordnik.
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.
If they are spelled the same then they are also homographs (and homonyms); if they are spelled differently then they are also heterographs (literally "different writing").