push-button radio vs tuner

push-button radio and tuner both are nouns.

Word	Noun	Adjective	Verb	Adverb
push-button radio	Yes	No	No	No
tuner	Yes	No	No	No

As nouns, tuner is a hypernym of push-button radio; that is, tuner is a word with a broader meaning than push-button radio:

push-button radio: a radio receiver that can be tuned by pressing buttons
tuner: an electronic receiver that detects and demodulates and amplifies transmitted signals

Other hypernyms of push-button radio include radio, radio receiver, radio set, receiving set, wireless.

push-button radio (noun)	tuner (noun)
a radio receiver that can be tuned by pressing buttons	an electronic receiver that detects and demodulates and amplifies transmitted signals
	someone who tunes a musical instrument