Remove text from a txt file that is in an array - linux

Question

So I have these two functions: cMinOption and cMaxOption.
cMinOption puts all words from pt.stop_words.txt into myArray.
cMaxOption shows a list of words from ficha01.pdf.txt, including on that same list of words from pt.stop_words.txt.
I want to know how can I delete the words from the array I created and delete those words from the list that appears in the function cMaxOption.
cMinOption(){
declare -a myArray
mapfile -t myArray < pt.stop_words.txt
sed -i 's/myArray/""/g' ficha01.pdf.txt
sed -e 's/[^[:alpha:]]/ /g' ficha01.pdf.txt | tr '\n' " " | tr -s " " | tr " " '\n'| tr 'A-Z' 'a-z' | sort | uniq -c | sort -nr | nl | head -n 7
for ((i=0; i<204; i++)); do
echo "Element [$i]: ${myArray[$i]}";
done
}
# Called when -C is passed as argument
cMaxOption(){
# Check if the file passed in $1 is a PDF file
if [ $(head -c 4 "$1") = "%PDF" ]; then
pdftotext $1 $1.txt
echo "'$1': PDF file";
file="$1.txt"
else
echo "'$1': TXT file";
file="$1"
fi
echo "[INFO] processing '$file'"
echo "STOP WORDS will be counted"
echo "COUNT MODE"
sed -e 's/[^[:alpha:]]/ /g' $file | tr '\n' " " | tr -s " " | tr " " '\n'| tr 'A-Z' 'a-z' | sort | uniq -c | sort -nr | nl | head -n 7
mv $file result---$file
echo "RESULTS: 'result---$file' "
ls -l result---$file
echo -e " $(sort -u result---$file | wc -l) distinct words"
}