Check 2 variables for matching characters

hi
i am writing a hangman script and am having trouble checking the correct letters against the word
i need the script to compare the word against the letters guessed that are correct so once all the letters within the word have been guessed it will alow me to create a wining senario
this must be done without using sed or awk

eg

word
hello

guessed
adhewlso

this would be a correct result because all the letters within the word have been guessed

any help would be appreciated im stumped by this

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