Massage parlor and Red-light district

Massage parlor noun - A business establishment that offers therapeutic massage.

Red-light district and massage parlor are semantically related In some cases you can use "Red-light district" instead a noun phrase "Massage parlor".

Red-light district noun - A district with many brothels.

Massage parlor and red-light district are semantically related in brothel topic. You can use "Massage parlor" instead a noun phrase "Red-light district", if it concerns topics such as house of prostitution.