hypanthium

In botany terms the difference between receptacle and hypanthium

is that receptacle is the part of the flower stalk (peduncle or pedicel) to which the floral parts are attached; also torus while hypanthium is the bowl-shaped part of a flower on which the sepals, petals, and stamens are borne.

As nouns the difference between receptacle and hypanthium

is that receptacle is a container while hypanthium is the bowl-shaped part of a flower on which the sepals, petals, and stamens are borne.

Pericarpel is likely misspelled.

Pericarpel has no English definition.

As a noun hypanthium is

the bowl-shaped part of a flower on which the sepals, petals, and stamens are borne.

In botany terms the difference between hypanthium and perigynous

is that hypanthium is the bowl-shaped part of a flower on which the sepals, petals, and stamens are borne while perigynous is having a hypanthium.

As a noun hypanthium

is the bowl-shaped part of a flower on which the sepals, petals, and stamens are borne.

As an adjective perigynous is

having the stamens, petals or sepals situated around the ovary (especially, on the rim of the receptacle of a superior ovary).