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OK.

Since you have bash, you have string operations, so:

#!/bin/bash

STR="kitten"
GUESS="${STR//[a-z]/_}" # Replace all [a-z] with _

while [ "$GUESS" != "$STR" ]
do
IN=""
...

One way:

$ word=hello
$ guess=adhewlso
$ echo $word | fold -1 | sort -u | awk -v guess=$guess '{ m=match(guess,$0); if ( m == 0 ) { exit 1}}'
$ echo $?
0
$ guess=xyzhel
$ echo $word | fold...