Synonyms for Egg (same or very similar meaning)
WordNet sense 1 (oval reproductive body of a fowl (especially a hen) used as food):
eggsWordNet sense 2 (one of the two male reproductive glands that produce spermatozoa and secrete androgens):
ball, nut, testicle, testis, ballock, bollock, orchisFrom the ODE community, based on WordNetadd/edit