opossum wood vs silver bell

opossum wood and silver bell both are nouns.

Word	Noun	Adjective	Verb	Adverb
opossum wood	Yes	No	No	No
silver bell	Yes	No	No	No

As nouns, silver bell is a hypernym of opossum wood; that is, silver bell is a word with a broader meaning than opossum wood:

opossum wood: medium-sized tree of West Virginia to Florida and Texas
silver bell: any of various deciduous trees of the genus Halesia having white bell-shaped flowers

opossum wood (noun)	silver bell (noun)
medium-sized tree of West Virginia to Florida and Texas	any of various deciduous trees of the genus Halesia having white bell-shaped flowers