Buttercup (noun)
Any of many herbs, of the genus Ranunculus, having yellow flowers; the crowfoot.
Buttercup (noun)
Any flower of the genus Narcissus; a daffodil.
Buttercup (noun)
Affectionate or ironic term of address.
Daisy (noun)
A wild flowering plant Bellis perennis of the Asteraceae family, with a yellow head and white petals
Daisy (noun)
Many other flowering plants of various species.
Daisy (noun)
A boot or other footwear.
Wiktionary