The words trussed, trust sound the same but have different meanings and spellings. Why do trussed, trust sound the same even though they are completely different words?
The answer is simple: trussed, trust are homophones of the English language.
Simple past tense and past participle of truss.
Firm reliance on the integrity, ability, or character of a person or thing.
Custody; care.
Something committed into the care of another; charge.
The condition and resulting obligation of having confidence placed in one: violated a public trust.
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").