Yiddish vs parve

Yiddish is a noun but parve is not a noun.

Word	Noun	Adjective	Verb	Adverb
Yiddish	Yes	No	No	No
parve	No	Yes	No	No

Yiddish (noun)	parve (noun)
a dialect of High German including some Hebrew and other words; spoken in Europe as a vernacular by many Jews; written in the Hebrew script

Yiddish (adjective)	parve (adjective)
	containing no meat or milk (or their derivatives) and thus eatable with both meat and dairy dishes according to the dietary laws of Judaism