Your question is a good example of a for loop with else clause. Please note: the indentation is valid, the else belongs to the for statement.

llw = [['apples','bananas'],['watermelons','melons']]
wordlist = ['bananas','strawberys','appricots','melons','watermelons']

for item in llw:
    for word in item:
        if word not in wordlist:
            print(f'{word} not in wordlist, skipping list {item}')
            break
    else:
        print(f'{item} was found in wordlist')

Out:

apples not in wordlist, skipping list ['apples', 'bananas']
['watermelons', 'melons'] was found in wordlist