unfamiliarity vs strange

unfamiliarity is a noun but strange is not a noun.

Word	Noun	Adjective	Verb	Adverb
unfamiliarity	Yes	No	No	No
strange	No	Yes	No	No

unfamiliarity (noun)	strange (noun)
unusualness as a consequence of not being well known

unfamiliarity (adjective)	strange (adjective)
	being definitely out of the ordinary and unexpected; slightly odd or even a bit weird
	relating to or originating in or characteristic of another place or part of the world
	not known before