waxberry vs wax myrtle

waxberry and wax myrtle both are nouns.

Word	Noun	Adjective	Verb	Adverb
waxberry	Yes	No	No	No
wax myrtle	Yes	No	No	No

As nouns, wax myrtle is a hypernym of waxberry; that is, wax myrtle is a word with a broader meaning than waxberry:

waxberry: deciduous aromatic shrub of eastern North America with grey-green wax-coated berries
wax myrtle: any shrub or small tree of the genus Myrica with aromatic foliage and small wax-coated berries

waxberry (noun)	wax myrtle (noun)
deciduous aromatic shrub of eastern North America with grey-green wax-coated berries	any shrub or small tree of the genus Myrica with aromatic foliage and small wax-coated berries
deciduous shrub of western North America having spikes of pink flowers followed by round white berries