A version of Astraware Crosswords with a selection of puzzles (and access to every daily and weekender puzzle) is bundled with the NOOK HD and HD+ models.
You can delete the game from your Nook, but as it is bundled for free, each time you update your Nook's firmware it will be downloaded and added again. To delete it for now, just tap and hold the icon, and select 'uninstall' and it will be gone!
You may find it easier to sort your apps into 'shelves', that way you can put Crosswords along with any other apps you don't use, into a separate shelf out of the way. Crosswords itself takes up very little space on your Nook so won't get in the way of anything else.
We've found a great little video tutorial for setting up shelves on your Nook on Youtube