Synonyms for Yellow Jacket (same or very similar meaning)
WordNet sense 1 (a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic):
Nembutal, pentobarbital, pentobarbital sodiumWordNet sense 2 (small yellow-marked social wasp commonly nesting in the ground):
Vespula maculifrons, yellow hornetFrom the ODE community, based on WordNetadd/edit