What is the antonym for word dormitory?

There isn't one single perfect antonym for "dormitory," as it depends on what aspect you want to contrast. However, depending on the context, some possibilities include:

* Private room/apartment/house: This contrasts the shared nature of a dormitory.

* Hotel/single occupancy room: This highlights the difference in the level of service and privacy.

* Individual dwelling: This is a more general contrast to the communal living aspect.

The best antonym will depend on the specific sentence in which you're using the word.