Hi,
you can do something like this:
$j12stuff = array('word1','word2','word3');
$query = "SELECT * FROM theTable WHERE ss_type='n' AND word IN ('";
$query .= implode("','",$j12stuff);
$query .= "')";
Don't forget to escape single quotes in the array members. You might run into troubles if the array is too large because MySQL has a limit regarding the length of a query string.
Regards,
Thomas