bay willow vs Salix pentandra

bay willow and Salix pentandra both are nouns.

Word	Noun	Adjective	Verb	Adverb
bay willow	Yes	No	No	No
Salix pentandra	Yes	No	No	No

As nouns, bay willow and Salix pentandra are synonyms defined as:

bay willow and Salix pentandra: European willow tree with shining leathery leaves; widely naturalized in the eastern United States

Other synonyms of bay willow include laurel willow.

bay willow (noun)	Salix pentandra (noun)
European willow tree with shining leathery leaves; widely naturalized in the eastern United States	European willow tree with shining leathery leaves; widely naturalized in the eastern United States