pussy willow vs Salix caprea

pussy willow and Salix caprea both are nouns.

Word	Noun	Adjective	Verb	Adverb
pussy willow	Yes	No	No	No
Salix caprea	Yes	No	No	No

As nouns, pussy willow and Salix caprea are synonyms defined as:

pussy willow and Salix caprea: much-branched Old World willow having large catkins and relatively large broad leaves

Other synonyms of pussy willow include florist's willow, goat willow.

pussy willow (noun)	Salix caprea (noun)
small willow of eastern North America having greyish leaves and silky catkins that come before the leaves	much-branched Old World willow having large catkins and relatively large broad leaves
much-branched Old World willow having large catkins and relatively large broad leaves