floral cup vs calyx tube

floral cup and calyx tube both are nouns.

Word	Noun	Adjective	Verb	Adverb
floral cup	Yes	No	No	No
calyx tube	Yes	No	No	No

As nouns, floral cup and calyx tube are synonyms defined as:

floral cup and calyx tube: 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 hypanthium.

floral cup (noun)	calyx tube (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)