no swear

noswear.js

var terms = ['shit', 'fuck'].map(s => ' ' + s + ' ');
var re = RegExp(terms.join('|'));
var hasBadWords = function (str) { return re.test(' ' + str + ' '); };

hasBadWords("hit me duck"); // false
hasBadWords("holy shit");   // true
hasBadWords("My assistant couldn't find shitake mushrooms."); // false

You don't need the map.

var re = new RegExp('\\b(?:' + words.join('|') + ')\\b');