daisy vs common daisy

daisy and common daisy both are nouns.

Word	Noun	Adjective	Verb	Adverb
daisy	Yes	No	No	No
common daisy	Yes	No	No	No

As nouns, common daisy is a hyponym of daisy; that is, common daisy is a word with a more specific, narrower meaning than daisy:

daisy: any of numerous composite plants having flower heads with well-developed ray flowers usually arranged in a single whorl
common daisy: low-growing Eurasian plant with yellow central disc flowers and pinkish-white outer ray flowers

Other hyponyms of daisy include Bellis perennis, English daisy.

daisy (noun)	common daisy (noun)
any of numerous composite plants having flower heads with well-developed ray flowers usually arranged in a single whorl	low-growing Eurasian plant with yellow central disc flowers and pinkish-white outer ray flowers