skylark vs Alauda arvensis

skylark and Alauda arvensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
skylark	Yes	No	Yes	No
Alauda arvensis	Yes	No	No	No

As nouns, skylark and Alauda arvensis are synonyms defined as:

skylark and Alauda arvensis: brown-speckled European lark noted for singing while hovering at a great height

skylark (noun)	Alauda arvensis (noun)
brown-speckled European lark noted for singing while hovering at a great height	brown-speckled European lark noted for singing while hovering at a great height

skylark (verb)	Alauda arvensis (verb)
play boisterously