dwarf grey willow vs dwarf gray willow

dwarf grey willow and dwarf gray willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
dwarf grey willow	Yes	No	No	No
dwarf gray willow	Yes	No	No	No

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

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

Other synonyms of dwarf grey willow include sage willow, Salix tristis.

dwarf grey willow (noun)	dwarf gray willow (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