WordNet sense 1 (a small secluded room):

cubbyhole, cubby, snuggery

WordNet sense 2 (kept safe or defended from danger or injury or loss):

protected, secure

WordNet sense 3 (fitting closely but comfortably):

close, close-fitting

WordNet sense 4 (closely constrained or constricted or constricting):

tight

WordNet sense 5 (enjoying or affording comforting warmth and shelter especially in a small space):

cosy, cozy

WordNet sense 6 (providing or experiencing physical well-being or relief (`comfy' is informal)):

comfortable, comfy