Portcullis and Revolving door

Portcullis noun - Gate consisting of an iron or wooden grating that hangs in the entry to a castle or fortified town; can be lowered to prevent passage.

Revolving door and portcullis are semantically related in movable barrier at entrance topic. In some cases you can use "Revolving door" instead a noun "Portcullis".

Revolving door noun - A door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings.

Portcullis and revolving door are semantically related in movable barrier at entrance topic. You can use "Portcullis" instead a noun phrase "Revolving door".