superhet vs tuner

superhet and tuner both are nouns.

Word	Noun	Adjective	Verb	Adverb
superhet	Yes	No	No	No
tuner	Yes	No	No	No

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

superhet: 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 superhet include radio, radio receiver, radio set, receiving set, wireless.

superhet (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