SQL : find words that repeat in differents rows of a table : For exemple, I have that table

    id      title
    1       abcd apple 
    2       adqsdd google
    3       adzdaz android
    4       gdfgdfg apple
    5       yuiyu windows

so, we can see that the word **"apple"** is repeated in différents rows.
How can I do a SQL Query, that will display who is the words repeat in differents rows , so it will display me : **"apple"**