Orchis spectabilis vs purple orchis

Orchis spectabilis and purple orchis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Orchis spectabilis	Yes	No	No	No
purple orchis	Yes	No	No	No

As nouns, Orchis spectabilis and purple orchis are synonyms defined as:

Orchis spectabilis and purple orchis: North American orchid having a spike of violet-purple flowers mixed with white; sepals and petals form a hood

Other synonyms of Orchis spectabilis include purple-hooded orchis, showy orchis.

Orchis spectabilis (noun)	purple orchis (noun)
North American orchid having a spike of violet-purple flowers mixed with white; sepals and petals form a hood	North American orchid having a spike of violet-purple flowers mixed with white; sepals and petals form a hood