star-thistle vs Centauria calcitrapa

star-thistle and Centauria calcitrapa both are nouns.

Word	Noun	Adjective	Verb	Adverb
star-thistle	Yes	No	No	No
Centauria calcitrapa	Yes	No	No	No

As nouns, star-thistle and Centauria calcitrapa are synonyms defined as:

star-thistle and Centauria calcitrapa: Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America

Other synonyms of star-thistle include caltrop.

star-thistle (noun)	Centauria calcitrapa (noun)
Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America	Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America