Heimdallr vs Heimdall

Heimdallr and Heimdall both are nouns.

Word	Noun	Adjective	Verb	Adverb
Heimdallr	Yes	No	No	No
Heimdall	Yes	No	No	No

As nouns, Heimdallr and Heimdall are synonyms defined as:

Heimdallr and Heimdall: (Norse mythology) god of dawn and light; guardian of Asgard

Other synonyms of Heimdallr include Heimdal.

Heimdallr (noun)	Heimdall (noun)
(Norse mythology) god of dawn and light; guardian of Asgard	(Norse mythology) god of dawn and light; guardian of Asgard