tone arm vs pickup arm

tone arm and pickup arm both are nouns.

Word	Noun	Adjective	Verb	Adverb
tone arm	Yes	No	No	No
pickup arm	Yes	No	No	No

As nouns, tone arm and pickup arm are synonyms defined as:

tone arm and pickup arm: mechanical device consisting of a light balanced arm that carries the cartridge

Other synonyms of tone arm include pickup.

tone arm (noun)	pickup arm (noun)
mechanical device consisting of a light balanced arm that carries the cartridge	mechanical device consisting of a light balanced arm that carries the cartridge