Synonyms for Roach (same or very similar meaning)
WordNet sense 1 (street names for flunitrazepan):
circle, rope, roofy, rophy, forget me drug, Mexican valiumWordNet sense 2 (any of numerous chiefly nocturnal insects; some are domestic pests):
cockroachWordNet sense 3 (European freshwater food fish having a greenish back):
Rutilus rutilusFrom the ODE community, based on WordNetadd/edit