lammergeier vs lammergeyer

lammergeier and lammergeyer both are nouns.

Word	Noun	Adjective	Verb	Adverb
lammergeier	Yes	No	No	No
lammergeyer	Yes	No	No	No

As nouns, lammergeier and lammergeyer are synonyms defined as:

lammergeier and lammergeyer: the largest Eurasian bird of prey; having black feathers hanging around the bill

Other synonyms of lammergeier include bearded vulture, Gypaetus barbatus.

lammergeier (noun)	lammergeyer (noun)
the largest Eurasian bird of prey; having black feathers hanging around the bill	the largest Eurasian bird of prey; having black feathers hanging around the bill