Synonyms for Choker (same or very similar meaning)
WordNet sense 1 (someone who kills by strangling):
garroter, strangler, throttler, garrotterWordNet sense 2 (necklace that fits tightly around a woman's neck):
collar, neckband, dog collarWordNet sense 3 (a high tight collar):
ruff, ruffle, neck ruffFrom the ODE community, based on WordNetadd/edit