The words waited, weighted sound the same but have different meanings and spellings. Why do waited, weighted sound the same even though they are completely different words?
The answer is simple: waited, weighted are homophones of the English language.
Simple past tense and past participle of wait.
Made heavy or heavier by the addition of something: a weighted base.
Statistics Adjusted to reflect value or proportion: a weighted average.
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").