And here's info about Barrow-wights: http://tolkiengateway.net/wiki/Barrow-wights and Houseless Elves: http://askmiddlearth.tumblr.com/post/65619642239/ghosts-in-middle-earth - what that post doesn't mention is that the Houseless are generally elf spirits, hence the tag. Both tags are plural because there's more than one creature of that type, not necessarily because they appear or act in a group. I hope that makes that acceptable?