showy orchis vs purple orchis

showy orchis and purple orchis both are nouns.

Word	Noun	Adjective	Verb	Adverb
showy orchis	Yes	No	No	No
purple orchis	Yes	No	No	No

As nouns, showy orchis and purple orchis are synonyms defined as:

showy orchis 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 showy orchis include Orchis spectabilis, purple-hooded orchis.

showy orchis (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