Lactuca serriola vs horse thistle

Lactuca serriola and horse thistle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lactuca serriola	Yes	No	No	No
horse thistle	Yes	No	No	No

As nouns, Lactuca serriola and horse thistle are synonyms defined as:

Lactuca serriola and horse thistle: European annual wild lettuce having prickly stems; a troublesome weed in parts of United States

Other synonyms of Lactuca serriola include Lactuca scariola, prickly lettuce.

Lactuca serriola (noun)	horse thistle (noun)
European annual wild lettuce having prickly stems; a troublesome weed in parts of United States	European annual wild lettuce having prickly stems; a troublesome weed in parts of United States