mythical being vs golem

mythical being and golem both are nouns.

Word	Noun	Adjective	Verb	Adverb
mythical being	Yes	No	No	No
golem	Yes	No	No	No

As nouns, golem is a hyponym of mythical being; that is, golem is a word with a more specific, narrower meaning than mythical being:

mythical being: an imaginary being of myth or fable
golem: (Jewish folklore) an artificially created human being that is given life by supernatural means

Other hyponyms of mythical being include halcyon, mythical creature, mythical monster, phoenix, houri, Amazon, Gog and Magog, hero.

mythical being (noun)	golem (noun)
an imaginary being of myth or fable	a mechanism that can move automatically
	(Jewish folklore) an artificially created human being that is given life by supernatural means