common camas vs camas

common camas and camas both are nouns.

Word	Noun	Adjective	Verb	Adverb
common camas	Yes	No	No	No
camas	Yes	No	No	No

As nouns, camas is a hypernym of common camas; that is, camas is a word with a broader meaning than common camas:

common camas: plant having a large edible bulb and linear basal leaves and racemes of light to deep violet-blue star-shaped flowers on tall green scapes; western North America
camas: any of several plants of the genus Camassia; North and South America

Other hypernyms of common camas include camash, camass, camosh, quamash.

common camas (noun)	camas (noun)
plant having a large edible bulb and linear basal leaves and racemes of light to deep violet-blue star-shaped flowers on tall green scapes; western North America	any of several plants of the genus Camassia; North and South America