heterodyne receiver vs tuner

heterodyne receiver and tuner both are nouns.

Word	Noun	Adjective	Verb	Adverb
heterodyne receiver	Yes	No	No	No
tuner	Yes	No	No	No

As nouns, tuner is a hypernym of heterodyne receiver; that is, tuner is a word with a broader meaning than heterodyne receiver:

heterodyne receiver: a radio receiver that combines a locally generated frequency with the carrier frequency to produce a supersonic signal that is demodulated and amplified
tuner: an electronic receiver that detects and demodulates and amplifies transmitted signals

Other hypernyms of heterodyne receiver include radio, radio receiver, radio set, receiving set, wireless.

heterodyne receiver (noun)	tuner (noun)
a radio receiver that combines a locally generated frequency with the carrier frequency to produce a supersonic signal that is demodulated and amplified	an electronic receiver that detects and demodulates and amplifies transmitted signals
	someone who tunes a musical instrument