foreignness vs alienism

foreignness and alienism both are nouns.

Word	Noun	Adjective	Verb	Adverb
foreignness	Yes	No	No	No
alienism	Yes	No	No	No

As nouns, alienism is a hyponym of foreignness; that is, alienism is a word with a more specific, narrower meaning than foreignness:

Other hyponyms of foreignness include exoticism, exoticness, exotism, alienage.

foreignness (noun)	alienism (noun)
the quality of being alien or not native	the quality of being alien
	an obsolete term for the study and treatment of mental illness