relay vs bistable relay

relay and bistable relay both are nouns.

Word	Noun	Adjective	Verb	Adverb
relay	Yes	No	Yes	No
bistable relay	Yes	No	No	No

As nouns, bistable relay is a hyponym of relay; that is, bistable relay is a word with a more specific, narrower meaning than relay:

relay: electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit
bistable relay: a relay that maintains either contact position indefinitely without power applied to the coil.

Other hyponyms of relay include impulse relay, keep relay, latching relay, stay relay, monostable relay.

relay (noun)	bistable relay (noun)
the act of passing something along from one person or group to another	a relay that maintains either contact position indefinitely without power applied to the coil.
electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit
a race between teams; each member runs or swims part of the distance
a crew of workers who relieve another crew
a fresh team to relieve weary draft animals

relay (verb)	bistable relay (verb)
pass along
control or operate by relay