Stellaria media vs chickweed

Stellaria media and chickweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Stellaria media	Yes	No	No	No
chickweed	Yes	No	No	No

As nouns, chickweed is a hypernym of Stellaria media; that is, chickweed is a word with a broader meaning than Stellaria media:

Stellaria media: a common low-growing annual garden weed with small white flowers; cosmopolitan; so-called because it is eaten by chickens
chickweed: any of various plants of the genus Stellaria

Stellaria media (noun)	chickweed (noun)
a common low-growing annual garden weed with small white flowers; cosmopolitan; so-called because it is eaten by chickens	any of various plants of the genus Stellaria
	any of various plants related to the common chickweed