pew vs church bench

pew and church bench both are nouns.

Word	Noun	Adjective	Verb	Adverb
pew	Yes	No	No	No
church bench	Yes	No	No	No

As nouns, pew and church bench are synonyms defined as:

pew and church bench: long bench with backs; used in church by the congregation

pew (noun)	church bench (noun)
long bench with backs; used in church by the congregation	long bench with backs; used in church by the congregation