Armenian vs Hayastan

Armenian and Hayastan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Armenian	Yes	Yes	No	No
Hayastan	Yes	No	No	No

Armenian (noun)	Hayastan (noun)
the Indo-European language spoken predominantly in Armenia, but also in Azerbaijan	a landlocked republic in southwestern Asia; formerly an Asian soviet; modern Armenia is but a fragment of ancient Armenia which was one of the world's oldest civilizations; throughout 2500 years the Armenian people have been invaded and oppressed by their neighbors
a writing system having an alphabet of 38 letters in which the Armenian language is written
a native or inhabitant of Armenia

Armenian (adjective)	Hayastan (adjective)
of or pertaining to Armenia or the people or culture of Armenia