sour gourd vs flowering tree

sour gourd and flowering tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
sour gourd	Yes	No	No	No
flowering tree	Yes	No	No	No

As nouns, flowering tree is a hypernym of sour gourd; that is, flowering tree is a word with a broader meaning than sour gourd:

sour gourd: Australian tree having an agreeably acid fruit that resembles a gourd
flowering tree: any tree having seeds and ovules contained in the ovary

Other hypernyms of sour gourd include angiospermous tree.

sour gourd (noun)	flowering tree (noun)
acid-tasting Australian gourd-like fruit with a woody rind and large seeds	any tree having seeds and ovules contained in the ovary
African gourd-like fruit with edible pulp
Australian tree having an agreeably acid fruit that resembles a gourd