radio transmitter vs sender

radio transmitter and sender both are nouns.

Word	Noun	Adjective	Verb	Adverb
radio transmitter	Yes	No	No	No
sender	Yes	No	No	No

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

radio transmitter: transmitter that is the part of a radio system that transmits signals
sender: set used to broadcast radio or tv signals

Other hypernyms of radio transmitter include transmitter.

radio transmitter (noun)	sender (noun)
transmitter that is the part of a radio system that transmits signals	set used to broadcast radio or tv signals
	someone who transmits a message