Pythia vs Pythoness

Pythia and Pythoness both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pythia	Yes	No	No	No
Pythoness	Yes	No	No	No

As nouns, Pythia and Pythoness are synonyms defined as:

Pythia and Pythoness: (Greek mythology) the priestess of Apollo at Delphi who transmitted the oracles

Pythia (noun)	Pythoness (noun)
(Greek mythology) the priestess of Apollo at Delphi who transmitted the oracles	(Greek mythology) the priestess of Apollo at Delphi who transmitted the oracles