dwarf gray willow vs dwarf grey willow

dwarf gray willow and dwarf grey willow both are nouns.

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

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

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

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

dwarf gray willow (noun)	dwarf grey 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