Ingerman vs Russian

Ingerman and Russian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ingerman	Yes	No	No	No
Russian	Yes	Yes	No	No

As nouns, Russian is a hypernym of Ingerman; that is, Russian is a word with a broader meaning than Ingerman:

Ingerman: a member of western Finnish people formerly living in the Baltic province where Saint Petersburg was built
Russian: a native or inhabitant of Russia

Ingerman (noun)	Russian (noun)
a member of western Finnish people formerly living in the Baltic province where Saint Petersburg was built	the Slavic language that is the official language of Russia
	a native or inhabitant of Russia

Ingerman (adjective)	Russian (adjective)
	of or pertaining to or characteristic of Russia or its people or culture or language