牡 - male

oyster; oyster shell

rice cooked together with oyster meat, etc.

oysters cooked in the shell

male and female (animals)

ram (sheep)

bull; ox; steer

Taurus (constellation); the Bull

Pacific oyster (Crassostrea gigas)

spiny oyster (Saccostrea kegaki)

tree peony (Paeonia suffruticosa); moutan

male horse

Aries (constellation); the Ram