Synonyms for Bollock (same or very similar meaning)
WordNet sense 1 (one of the two male reproductive glands that produce spermatozoa and secrete androgens):
ball, egg, nut, testicle, testis, ballock, orchisWordNet sense 2 (a pulley-block at the head of a topmast):
bullock blockFrom the ODE community, based on WordNetadd/edit