whizz vs expert

whizz and expert both are nouns.

Word	Noun	Adjective	Verb	Adverb
whizz	Yes	No	Yes	No
expert	Yes	Yes	No	No

As nouns, expert is a hypernym of whizz; that is, expert is a word with a broader meaning than whizz:

whizz (noun)	expert (noun)
someone who is dazzlingly skilled in any field	a person with special knowledge or ability who performs skillfully

whizz (adjective)	expert (adjective)
	having or showing knowledge and skill and aptitude
	of or relating to or requiring special knowledge to be understood

whizz (verb)	expert (verb)
move along very quickly
make a soft swishing sound