five-flowered gentian vs stiff gentian

five-flowered gentian and stiff gentian both are nouns.

Word	Noun	Adjective	Verb	Adverb
five-flowered gentian	Yes	No	No	No
stiff gentian	Yes	No	No	No

As nouns, five-flowered gentian and stiff gentian are synonyms defined as:

five-flowered gentian and stiff gentian: gentian of eastern North America having clusters of bristly blue flowers

Other synonyms of five-flowered gentian include ague weed, agueweed, Gentiana quinquefolia, Gentianella quinquefolia.

five-flowered gentian (noun)	stiff gentian (noun)
gentian of eastern North America having clusters of bristly blue flowers	gentian of eastern North America having clusters of bristly blue flowers