virtuoso vs expert

virtuoso and expert both are nouns.

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

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

virtuoso (noun)	expert (noun)
someone who is dazzlingly skilled in any field	a person with special knowledge or ability who performs skillfully
a musician who is a consummate master of technique and artistry

virtuoso (adjective)	expert (adjective)
having or revealing supreme mastery or skill	having or showing knowledge and skill and aptitude
	of or relating to or requiring special knowledge to be understood