As nouns the difference between poppy and popsy
is that
poppy is any plant of the species
Papaver, with crumpled often red petals and a milky juice while
popsy is grandfather.
As an adjective poppy
is of a bright red color, tinted with orange, like that of the poppy flower.
As a proper noun Poppy
is (mostly U.K.) {{given name|female|from=English}}, a flower name used since the end of the 19th century.