Ass and Haunches

Ass noun - A sturdy and patient domestic mammal that is used especially to carry things.

Haunches and ass are semantically related In some cases you can use "Haunches" instead a noun "Ass".

Haunches noun - The part of the body upon which someone sits.

Ass and haunches are semantically related (North American) in vulgar slang topic. Sometimes you can use "Ass" instead a noun "Haunches".