The words scene, seen sound the same but have different meanings and spellings. Why do scene, seen sound the same even though they are completely different words?
The answer is simple: scene, seen are homophones of the English language.
Something seen by a viewer; a view or prospect.
Something seen by a viewer; a view or prospect.
The place where an action or event occurs: the scene of the crime.
The place in which the action of a play, movie, novel, or other narrative occurs; a setting.
Past participle of see1.
Definitions 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").