Freyja vs Freya

Freyja and Freya both are nouns.

Word	Noun	Adjective	Verb	Adverb
Freyja	Yes	No	No	No
Freya	Yes	No	No	No

As nouns, Freyja and Freya are synonyms defined as:

Freyja and Freya: (Norse mythology) goddess of love and fecundity; daughter of Njorth and sister of Frey

Freyja (noun)	Freya (noun)
(Norse mythology) goddess of love and fecundity; daughter of Njorth and sister of Frey	(Norse mythology) goddess of love and fecundity; daughter of Njorth and sister of Frey