genealogist vs expert

genealogist and expert both are nouns.

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

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

genealogist (noun)	expert (noun)
an expert in genealogy	a person with special knowledge or ability who performs skillfully

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