wiper arm vs contact arm

wiper arm and contact arm both are nouns.

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

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

wiper arm 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 arm include wiper.

wiper arm (noun)	contact 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