cosmetologist vs expert

cosmetologist and expert both are nouns.

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

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

cosmetologist (noun)	expert (noun)
an expert in the use of cosmetics	a person with special knowledge or ability who performs skillfully

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