weeping willow vs Salix babylonica

weeping willow and Salix babylonica both are nouns.

Word	Noun	Adjective	Verb	Adverb
weeping willow	Yes	No	No	No
Salix babylonica	Yes	No	No	No

As nouns, weeping willow and Salix babylonica are synonyms defined as:

weeping willow and Salix babylonica: willow with long drooping branches and slender leaves native to China; widely cultivated as an ornamental

Other synonyms of weeping willow include Babylonian weeping willow.

weeping willow (noun)	Salix babylonica (noun)
willow with long drooping branches and slender leaves native to China; widely cultivated as an ornamental	willow with long drooping branches and slender leaves native to China; widely cultivated as an ornamental