purple saxifrage vs saxifrage

purple saxifrage and saxifrage both are nouns.

Word	Noun	Adjective	Verb	Adverb
purple saxifrage	Yes	No	No	No
saxifrage	Yes	No	No	No

As nouns, saxifrage is a hypernym of purple saxifrage; that is, saxifrage is a word with a broader meaning than purple saxifrage:

purple saxifrage: plants forming dense cushions with bright reddish-lavender flowers; rocky areas of Europe and Asia and western North America
saxifrage: any of various plants of the genus Saxifraga

Other hypernyms of purple saxifrage include breakstone, rockfoil.

purple saxifrage (noun)	saxifrage (noun)
plants forming dense cushions with bright reddish-lavender flowers; rocky areas of Europe and Asia and western North America	any of various plants of the genus Saxifraga