The noun has one meaning:
Meaning #1:
someone who is dazzlingly skilled in any field
Synonyms: ace, adept, sensation, maven, virtuoso, genius, hotshot, star, whiz, wizard, wiz
The verb whizz has 2 meanings:
Meaning #1:
make a soft swishing sound, as of a motor working or wings flapping
Synonyms: whiz, whirr, whir, birr, purr
Meaning #2:
move along very quickly
Synonyms: zoom, zoom along, whizz along
