clock radio vs radio receiver

clock radio and radio receiver both are nouns.

Word	Noun	Adjective	Verb	Adverb
clock radio	Yes	No	No	No
radio receiver	Yes	No	No	No

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

clock radio: a radio that includes a clock that can be set to turn it on automatically
radio receiver: an electronic receiver that detects and demodulates and amplifies transmitted signals

Other hypernyms of clock radio include radio, radio set, receiving set, tuner, wireless.

clock radio (noun)	radio receiver (noun)
a radio that includes a clock that can be set to turn it on automatically	an electronic receiver that detects and demodulates and amplifies transmitted signals