The words fleche, flesh sound the same but have different meanings and spellings. Why do fleche, flesh sound the same even though they are completely different words?
The answer is simple: fleche, flesh are homophones of the English language.
Alternative spelling of flèche.
The surface or skin of the human body.
The soft tissue of the body of a vertebrate, covering the bones and consisting mainly of skeletal muscle and fat.
The meat of animals as distinguished from the edible tissue of fish or fowl.
Botany The pulpy, usually edible part of a fruit or vegetable.
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.