contact arm vs wiper

contact arm and wiper both are nouns.

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

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

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

Other synonyms of contact arm include wiper arm.

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