comm -13 list1 list2 | while read l ; do echo $l ; done

while read list2 ; do
        grep $list2 list1 &>/dev/null
        if [ $? -eq 1 ] ; then
                echo $list2
        fi
done < list2

# cat list1
abc jones oracle smith ssm tty

# cat list2
abc jones lmn smith ssm xyz

#!/bin/bash

FLAG=0
while read list2_line
do
        for list2_word in $list2_line
        do
                while read list1_line
                do
                        for list1_word in $list1_line
                        do
                                [[ "$list2_word" == "$list1_word" ]] && FLAG=1
                        done
                        [[ $FLAG -eq 0 ]] && echo -e "$list2_word \c"; FLAG=0
                done < list1
        done
done < list2
echo

# ./search.sh
lmn xyz