The words licht, licked sound the same but have different meanings and spellings. Why do licht, licked sound the same even though they are completely different words?
The answer is simple: licht, licked are homophones of the English language.
An obsolete or dialectal form of light.
An obsolete or dialectal (Scotch) form of light.
To pass the tongue over or along: lick a stamp.
To lap up.
To lap or flicker at like a tongue: The waves licked the sides of the boat.
Slang To punish with a beating; thrash.
Definitions from The Century Dictionary and Cyclopedia, 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").