relay transmitter vs amplifier

relay transmitter and amplifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
relay transmitter	Yes	No	No	No
amplifier	Yes	No	No	No

As nouns, amplifier is a hypernym of relay transmitter; that is, amplifier is a word with a broader meaning than relay transmitter:

relay transmitter: an amplifier for restoring the strength of a transmitted signal
amplifier: electronic equipment that increases strength of signals passing through it

relay transmitter (noun)	amplifier (noun)
an amplifier for restoring the strength of a transmitted signal	electronic equipment that increases strength of signals passing through it