wiper vs contact arm

wiper and contact arm both are nouns.

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

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

wiper and contact 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 wiper arm.

wiper (noun)	contact 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