myrtle vs angiospermous tree

myrtle and angiospermous tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
myrtle	Yes	No	No	No
angiospermous tree	Yes	No	No	No

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

Other hypernyms of myrtle include flowering tree.

myrtle (noun)	angiospermous tree (noun)
any evergreen shrub or tree of the genus Myrtus	any tree having seeds and ovules contained in the ovary
widely cultivated as a groundcover for its dark green shiny leaves and usually blue-violet flowers