You can keep some specific tags hidden from tag lists and tag clouds of your WordPress site. You can very easily specify a list of tags whom you like keeping hidden and these selected tags will go invisible for your website users and won’t show up on the places like tag clouds and post tags lists present below the post etc while keeping their archives safe and accessible.
How To Hide Tags In WordPress?
Install and activate Oomph Hidden Tags plugin. After activation visit your admin area Dashboard -> Settings -> Reading page, scroll down to Hide Tags section and type tags (comma separated) you don’t want showing to your website visitors.