Salix sitchensis vs silky willow

Salix sitchensis and silky willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salix sitchensis	Yes	No	No	No
silky willow	Yes	No	No	No

As nouns, Salix sitchensis and silky willow are synonyms defined as:

Salix sitchensis and silky willow: small shrubby tree of western North America (Alaska to Oregon)

Other synonyms of Salix sitchensis include Sitka willow.

Salix sitchensis (noun)	silky willow (noun)
small shrubby tree of western North America (Alaska to Oregon)	North American willow with greyish silky pubescent leaves that usually blacken in drying
	small shrubby tree of western North America (Alaska to Oregon)