summer hyacinth vs Hyacinthus candicans

summer hyacinth and Hyacinthus candicans both are nouns.

Word	Noun	Adjective	Verb	Adverb
summer hyacinth	Yes	No	No	No
Hyacinthus candicans	Yes	No	No	No

As nouns, summer hyacinth and Hyacinthus candicans are synonyms defined as:

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

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

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