contact arm vs wiper arm

contact arm and wiper arm both are nouns.

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

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

contact arm 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 contact arm include wiper.

contact arm (noun)	wiper arm (noun)
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