summer hyacinth vs cape hyacinth

summer hyacinth and cape hyacinth both are nouns.

Word	Noun	Adjective	Verb	Adverb
summer hyacinth	Yes	No	No	No
cape hyacinth	Yes	No	No	No

As nouns, summer hyacinth and cape hyacinth are synonyms defined as:

summer hyacinth and cape hyacinth: southern African herb with white bell-shaped flowers

Other synonyms of summer hyacinth include Galtonia candicans, Hyacinthus candicans.

summer hyacinth (noun)	cape hyacinth (noun)
southern African herb with white bell-shaped flowers	southern African herb with white bell-shaped flowers