curl https://randomword.com/ | grep -oE '[a-z]{4,12}' | xargs -I{} printf '{{echo {} | tr [:upper:] [:lower:] }}\n'

This command will retrieve a random word from the website randomword.com, then it will filter out words that are between 4 and 12 characters long. Finally, it will convert the word to lowercase and print it out.
curl https://randomword.com/ | grep -oE '[a-z]{4,12}' | xargs -I{} printf '{{echo {} | tr [:upper:] [:lower:] }}\n'