floral cup vs hypanthium

floral cup and hypanthium both are nouns.

Word	Noun	Adjective	Verb	Adverb
floral cup	Yes	No	No	No
hypanthium	Yes	No	No	No

As nouns, floral cup and hypanthium are synonyms defined as:

floral cup and hypanthium: the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae)

Other synonyms of floral cup include calyx tube.

floral cup (noun)	hypanthium (noun)
the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae)	the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae)