Jew vs Reform Jew

Jew and Reform Jew both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jew	Yes	No	No	No
Reform Jew	Yes	No	No	No

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

Jew: a person belonging to the worldwide group claiming descent from Jacob (or converted to it) and connected by cultural or religious ties
Reform Jew: liberal Jew who tries to adapt all aspects of Judaism to modern circumstances

Jew (noun)	Reform Jew (noun)
a person belonging to the worldwide group claiming descent from Jacob (or converted to it) and connected by cultural or religious ties	liberal Jew who tries to adapt all aspects of Judaism to modern circumstances