red clover vs purple clover

red clover and purple clover both are nouns.

Word	Noun	Adjective	Verb	Adverb
red clover	Yes	No	No	No
purple clover	Yes	No	No	No

As nouns, red clover and purple clover are synonyms defined as:

red clover and purple clover: erect to decumbent short-lived perennial having red-purple to pink flowers; the most commonly grown forage clover

Other synonyms of red clover include Trifolium pratense.

red clover (noun)	purple clover (noun)
erect to decumbent short-lived perennial having red-purple to pink flowers; the most commonly grown forage clover	erect to decumbent short-lived perennial having red-purple to pink flowers; the most commonly grown forage clover