purple orchis vs Orchis spectabilis

purple orchis and Orchis spectabilis both are nouns.

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

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

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

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

purple orchis (noun)	Orchis spectabilis (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