Yggdrasil vs Ygdrasil

Yggdrasil and Ygdrasil both are nouns.

Word	Noun	Adjective	Verb	Adverb
Yggdrasil	Yes	No	No	No
Ygdrasil	Yes	No	No	No

As nouns, Yggdrasil and Ygdrasil are synonyms defined as:

Yggdrasil and Ygdrasil: (Norse mythology) a huge ash tree whose roots and branches hold the earth and Heaven and Hell together

Yggdrasil (noun)	Ygdrasil (noun)
(Norse mythology) a huge ash tree whose roots and branches hold the earth and Heaven and Hell together	(Norse mythology) a huge ash tree whose roots and branches hold the earth and Heaven and Hell together