seidr vs seithr

seidr and seithr both are nouns.

Word	Noun	Adjective	Verb	Adverb
seidr	Yes	No	No	No
seithr	Yes	No	No	No

As nouns, seidr and seithr are synonyms defined as:

seidr and seithr: an Old Norse term for a type of sorcery which was practiced in Norse society during the Late Scandinavian Iron Age.

Other synonyms of seidr include seid, seidh, seidhr, seith.

seidr (noun)	seithr (noun)
an Old Norse term for a type of sorcery which was practiced in Norse society during the Late Scandinavian Iron Age.	an Old Norse term for a type of sorcery which was practiced in Norse society during the Late Scandinavian Iron Age.