The words depravation, deprivation sound the same but have different meanings and spellings. Why do depravation, deprivation sound the same even though they are completely different words?
The answer is simple: depravation, deprivation are homophones of the English language.
The act of depraving, or making anything bad; the act of corrupting.
The state of being depraved or degenerated; degeneracy; depravity.
Change for the worse; deterioration; morbid perversion.
The act or an instance of depriving; loss.
The condition of being deprived; privation.
A removal of rank or office.
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").