Segway vs electrical device

Segway and electrical device both are nouns.

Word	Noun	Adjective	Verb	Adverb
Segway	Yes	No	No	No
electrical device	Yes	No	No	No

As nouns, electrical device is a hypernym of Segway; that is, electrical device is a word with a broader meaning than Segway:

Segway: (trademark) a self-balancing personal transportation device with two wheels; can operate in any level pedestrian environment
electrical device: a device that produces or is powered by electricity

Segway (noun)	electrical device (noun)
(trademark) a self-balancing personal transportation device with two wheels; can operate in any level pedestrian environment	a device that produces or is powered by electricity