genius vs expert

genius and expert both are nouns.

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

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

genius (noun)	expert (noun)
exceptional creative ability	a person with special knowledge or ability who performs skillfully
a natural talent
unusual mental ability
someone who has exceptional intellectual ability and originality
someone who is dazzlingly skilled in any field

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