control vs relay

control and relay both are nouns.

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

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

Other hyponyms of control include synchronise, synchronize, dial, turn, submarine, treadle, gate, pedal, drive, aviate, fly, pilot.

control (noun)	relay (noun)
the activity of managing or exerting control over something	the act of passing something along from one person or group to another
(physiology) regulation or maintenance of a function or action or reflex etc	electrical device such that current flowing through it in one circuit can switch on and off a current in a second circuit
a mechanism that controls the operation of a machine	a race between teams; each member runs or swims part of the distance
power to direct or determine	a crew of workers who relieve another crew
discipline in personal and social activities	a fresh team to relieve weary draft animals
great skillfulness and knowledge of some subject or activity
a standard against which other conditions can be compared in a scientific experiment
the economic policy of controlling or limiting or curbing prices or wages etc.
a spiritual agency that is assumed to assist the medium during a seance
a relation of constraint of one entity (thing or person or group) by another
the state that exists when one person or group has power over another

control (verb)	relay (verb)
have a firm understanding or knowledge of; be on top of	pass along
be careful or certain to do something; make certain of something	control or operate by relay
verify by using a duplicate register for comparison
handle and cause to function
maintain influence over (others or oneself) skillfully, usually to one's advantage
exercise authoritative control or power over
lessen the intensity of; temper; hold in restraint; hold or keep within limits
check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard
place under restrictions; limit access to by law