Silent hill is typically set in the town of silent hill, im most familiar with 2. You traverse the town hub to reach various places(prison,hotel,hospital,apartments,impossible places etc.) which are the levels, each level is a linear affair where you do puzzles and encounter monsters, typical survival horror stuff. Can you define 'hub'?http://tvtropes.org/pmwiki/pmwiki.php/Main/HubLevel
Hub is just a central area that connects to other levels and might be considered a level unto itself. Yakuza and no more heroes, halo ODST have hub worlds. Above examples all have a central map area that is traversed to get to each level, shops, quests. In yakuza and halo ODST you can battle foes in the hub level, no more heroes you can do jobs and assignation gigs and other mini games located around the hub.
It's not a massive sandbox so we call it a hub level/hub world I guess.
Sh4:the room has the titular room as a hub used to visit variour levels.
Sh3 is mostly linear, end of the game is set in silent hill and you roam it to reach levels for a bit.
In EW1 the safe room is your literal room that is safe from danger and is for saving/upgrading/safe goodies, so it's like re4 merchant but a whole small area, maybe a hub within a hub haha. Though you do warp from level to level from the safe room sometimes but it's more of a mini shop area. In the executioner dlc the mansion is repurposed as a mini hub to go to each level, you can fight mobs and search for goodies in it and optional combat arenas.
Actually I think it might be more of a overworld, best not overthink it haha.http://tvtropes.org/pmwiki/pmwiki.php/Main/TheOverworld
Extract from above link;In terms of size and activity it is on the 3-part scale of Playable Menu (small, interactive list of places to go), Hub Level (mid size, warps you to other locations), and finally The Overworld (large, environment physically/geographically connected to other places).