Calyx and Whorl

Calyx noun - (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green.

Whorl and calyx are semantically related. In some cases you can use "Whorl" instead a noun "Calyx".

Whorl noun - A round shape formed by a series of concentric circles (as formed by leaves or flower petals).

Calyx and whorl are semantically related. Sometimes you can replace term "Calyx" with "Whorl", this nouns are similar.