Wordle
HTML UIdata strucures
You almost certainly know what Wordle is. If not: it's a word guessing game where the player has six chances to guess a five-letter word. After each guess the game indicates which letters in the guess are correct (coloring them green) and which ones are in the word but were in the wrong place in the guess (coloring them yellow). Guesses that aren't words are not allowed.
Both to generate the random word to be guessed and to disallow non-words you need a list of five-letter words. In the real Wordle there are two word lists: a shorter list of possible words to be guessed ad a longer list of words that are allowed as guesses.
In the real game there is on-screen keyboard so the user can enter their letters by clicking but can also type. In a refined version the user can also use backspace and enter.