geomancer vs diviner

geomancer and diviner both are nouns.

Word	Noun	Adjective	Verb	Adverb
geomancer	Yes	No	No	No
diviner	Yes	No	No	No

As nouns, diviner is a hypernym of geomancer; that is, diviner is a word with a broader meaning than geomancer:

geomancer: one who practices geomancy
diviner: someone who claims to discover hidden knowledge with the aid of supernatural powers

geomancer (noun)	diviner (noun)
one who practices geomancy	someone who claims to discover hidden knowledge with the aid of supernatural powers