Caudal
Part of speech: adjective
Definition: Pertaining to the tail or posterior or hind part of a body.
Posterior
Part of speech: adjective
Definition: Located behind, or towards the rear of an object.Nearer the back end; nearer the caudal end of the body in quadrupeds or the dorsal end in bipeds.Next to, or facing the main stem or axis.Following in order or in time.
Part of speech: noun
Definition: The buttocks.