Salix discolor vs pussy willow

Salix discolor and pussy willow both are nouns.

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

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

Salix discolor and pussy willow: small willow of eastern North America having greyish leaves and silky catkins that come before the leaves

Salix discolor (noun)	pussy willow (noun)
small willow of eastern North America having greyish leaves and silky catkins that come before the leaves	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