lady's thistle vs holy thistle

lady's thistle and holy thistle both are nouns.

Word	Noun	Adjective	Verb	Adverb
lady's thistle	Yes	No	No	No
holy thistle	Yes	No	No	No

As nouns, lady's thistle and holy thistle are synonyms defined as:

lady's thistle and holy thistle: tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America

Other synonyms of lady's thistle include blessed thistle, milk thistle, Our Lady's mild thistle, Silybum marianum.

lady's thistle (noun)	holy thistle (noun)
tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America	tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South America