The words starlet, starlit sound the same but have different meanings and spellings. Why do starlet, starlit sound the same even though they are completely different words?
The answer is simple: starlet, starlit are homophones of the English language.
A small star.
A young film actress publicized as a future star.
Illuminated by starlight.
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.