on-off switch vs on/off switch

on-off switch and on/off switch both are nouns.

Word	Noun	Adjective	Verb	Adverb
on-off switch	Yes	No	No	No
on/off switch	Yes	No	No	No

As nouns, on-off switch and on/off switch are synonyms defined as:

on-off switch and on/off switch: a hinged switch that can assume either of two positions

Other synonyms of on-off switch include toggle, toggle switch.

on-off switch (noun)	on/off switch (noun)
a hinged switch that can assume either of two positions	a hinged switch that can assume either of two positions