lammergeyer vs lammergeier

lammergeyer and lammergeier both are nouns.

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

As nouns, lammergeyer and lammergeier are synonyms defined as:

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

Other synonyms of lammergeyer include bearded vulture, Gypaetus barbatus.

lammergeyer (noun)	lammergeier (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