Synonyms for Whiz (same or very similar meaning)
WordNet sense 1 (someone who is dazzlingly skilled in any field):
ace, adept, champion, genius, hotshot, maven, sensation, star, superstar, virtuoso, whizz, wiz, wizard, mavin, adeptWordNet sense 2 (make a soft swishing sound):
purr, whir, whirr, birrFrom the ODE community, based on WordNetadd/edit