calyculus vs bract

calyculus and bract both are nouns.

Word	Noun	Adjective	Verb	Adverb
calyculus	Yes	No	No	No
bract	Yes	No	No	No

As nouns, bract is a hypernym of calyculus; that is, bract is a word with a broader meaning than calyculus:

calyculus: a group of bracts simulating a calyx as in a carnation or hibiscus
bract: a modified leaf or leaflike part just below and protecting an inflorescence

calyculus (noun)	bract (noun)
a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp)	a modified leaf or leaflike part just below and protecting an inflorescence
a group of bracts simulating a calyx as in a carnation or hibiscus