white ash vs ghost gum

white ash and ghost gum both are nouns.

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

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

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

Other synonyms of white ash include Eucalyptus coriacea, Eucalyptus pauciflora, snow gum.

white ash (noun)	ghost gum (noun)
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
small to medium-sized tree of Australia and Tasmania having smooth white to light-grey bark shedding in patches or strips