hellhound vs Cerberus

hellhound and Cerberus both are nouns.

Word	Noun	Adjective	Verb	Adverb
hellhound	Yes	No	No	No
Cerberus	Yes	No	No	No

As nouns, hellhound and Cerberus are synonyms defined as:

hellhound and Cerberus: (Greek mythology) the three-headed dog guarding the entrance to Hades; son of Typhon

hellhound (noun)	Cerberus (noun)
a very evil man	(Greek mythology) the three-headed dog guarding the entrance to Hades; son of Typhon
(Greek mythology) the three-headed dog guarding the entrance to Hades; son of Typhon