Brynhild vs Brynhildr

Brynhild and Brynhildr both are nouns.

Word	Noun	Adjective	Verb	Adverb
Brynhild	Yes	No	No	No
Brynhildr	Yes	No	No	No

As nouns, Brynhild and Brynhildr are synonyms defined as:

Brynhild and Brynhildr: a Valkyrie or a queen in the Nibelungenlied who loved the hero Siegfried; when he deceived her she had him killed and then committed suicide

Other synonyms of Brynhild include Brunhild, Brunnhilde.

Brynhild (noun)	Brynhildr (noun)
a Valkyrie or a queen in the Nibelungenlied who loved the hero Siegfried; when he deceived her she had him killed and then committed suicide	a Valkyrie or a queen in the Nibelungenlied who loved the hero Siegfried; when he deceived her she had him killed and then committed suicide