Herakles vs Hercules

Herakles and Hercules both are nouns.

Word	Noun	Adjective	Verb	Adverb
Herakles	Yes	No	No	No
Hercules	Yes	No	No	No

As nouns, Herakles and Hercules are synonyms defined as:

Herakles and Hercules: (classical mythology) a hero noted for his strength; performed 12 immense labors to gain immortality

Other synonyms of Herakles include Alcides, Heracles.

Herakles (noun)	Hercules (noun)
(classical mythology) a hero noted for his strength; performed 12 immense labors to gain immortality	a large constellation in the Northern Hemisphere between Lyra and Corona Borealis
	(classical mythology) a hero noted for his strength; performed 12 immense labors to gain immortality