Ambrosia psilostachya vs perennial ragweed

Ambrosia psilostachya and perennial ragweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ambrosia psilostachya	Yes	No	No	No
perennial ragweed	Yes	No	No	No

As nouns, Ambrosia psilostachya and perennial ragweed are synonyms defined as:

Ambrosia psilostachya and perennial ragweed: coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico

Other synonyms of Ambrosia psilostachya include western ragweed.

Ambrosia psilostachya (noun)	perennial ragweed (noun)
coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico	coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico