pickup arm vs tone arm

pickup arm and tone arm both are nouns.

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

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

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

Other synonyms of pickup arm include pickup.

pickup arm (noun)	tone 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