I see some kosher items that on the kosher label it is written Parve where as others Parev. In Hebrew, we say Parve. What is the source for Parev? Why are there 2 slightly different words for indicating the same?
According to Wiktionary:
In Yiddish, פּאַרעוו (parev) is the predicative form and פּאַרעווע (pareve) the attributive form of the adjective.
Some speakers familiar with Yiddish use this distribution in English as well, e.g. My mom made a pareve casserole but This casserole is parev.