seithr vs seidr

seithr and seidr both are nouns.

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

As nouns, seithr and seidr are synonyms defined as:

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

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

seithr (noun)	seidr (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.