Synonyms for Blackguard (same or very similar meaning)
WordNet sense 1 (someone who is morally reprehensible):
bounder, cad, dog, heel, houndWordNet sense 2 (subject to laughter or ridicule):
guy, rib, ridicule, roast, make fun, jest at, laugh at, poke funWordNet sense 3 (use foul or abusive language towards):
abuse, shout, clapperclaw, abuseFrom the ODE community, based on WordNetadd/edit