heartthrob vs idol

heartthrob and idol both are nouns.

Word	Noun	Adjective	Verb	Adverb
heartthrob	Yes	No	No	No
idol	Yes	No	No	No

As nouns, idol is a hypernym of heartthrob; that is, idol is a word with a broader meaning than heartthrob:

Other hypernyms of heartthrob include matinee idol.

heartthrob (noun)	idol (noun)
an object of infatuation	a material effigy that is worshipped
	an ideal instance; a perfect embodiment of a concept
	someone who is adored blindly and excessively