dwarf gray willow vs Salix tristis

dwarf gray willow and Salix tristis both are nouns.

Word	Noun	Adjective	Verb	Adverb
dwarf gray willow	Yes	No	No	No
Salix tristis	Yes	No	No	No

As nouns, dwarf gray willow and Salix tristis are synonyms defined as:

dwarf gray willow and Salix tristis: willow shrub of dry places in the eastern United States having long narrow leaves canescent beneath

Other synonyms of dwarf gray willow include dwarf grey willow, sage willow.

dwarf gray willow (noun)	Salix tristis (noun)
willow shrub of dry places in the eastern United States having long narrow leaves canescent beneath	willow shrub of dry places in the eastern United States having long narrow leaves canescent beneath