snow gum vs white ash

snow gum and white ash both are nouns.

Word	Noun	Adjective	Verb	Adverb
snow gum	Yes	No	No	No
white ash	Yes	No	No	No

As nouns, snow gum and white ash are synonyms defined as:

snow gum and white ash: small to medium-sized tree of Australia and Tasmania having smooth white to light-grey bark shedding in patches or strips

Other synonyms of snow gum include Eucalyptus coriacea, Eucalyptus pauciflora, ghost gum.

snow gum (noun)	white ash (noun)
small to medium-sized tree of Australia and Tasmania having smooth white to light-grey bark shedding in patches or strips	spreading American ash with leaves pale green or silvery beneath and having hard brownish wood
	small to medium-sized tree of Australia and Tasmania having smooth white to light-grey bark shedding in patches or strips