hammer and sickle vs allegory

hammer and sickle and allegory both are nouns.

Word	Noun	Adjective	Verb	Adverb
hammer and sickle	Yes	No	No	No
allegory	Yes	No	No	No

As nouns, allegory is a hypernym of hammer and sickle; that is, allegory is a word with a broader meaning than hammer and sickle:

Other hypernyms of hammer and sickle include emblem.

hammer and sickle (noun)	allegory (noun)
the emblem on the flag of the Soviet Union	a short moral story (often with animal characters)
	an expressive style that uses fictional characters and events to describe some subject by suggestive resemblances; an extended metaphor
	a visible symbol representing an abstract idea