church bench vs pew

church bench and pew both are nouns.

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

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

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

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