wiper vs wiper arm

wiper and wiper arm both are nouns.

Word	Noun	Adjective	Verb	Adverb
wiper	Yes	No	No	No
wiper arm	Yes	No	No	No

As nouns, wiper and wiper arm are synonyms defined as:

wiper and wiper arm: contact consisting of a conducting arm that rotates over a series of fixed contacts and comes to rest on an outlet

Other synonyms of wiper include contact arm.

wiper (noun)	wiper arm (noun)
a mechanical device that cleans the windshield	contact consisting of a conducting arm that rotates over a series of fixed contacts and comes to rest on an outlet
contact consisting of a conducting arm that rotates over a series of fixed contacts and comes to rest on an outlet
a worker who wipes