Nouns

(n)cubby, cubbyhole, snuggery, snuga small secluded room

Adjectives

(s)snugoffering safety; well protected or concealed“a snug harbor”, “a snug hideout”
(s)close, snug, close-fittingfitting closely but comfortably“a close fit”
(s)snugwell and tightly constructed“a snug house”, “a snug little sailboat”
(s)cozy, cosy, snugenjoying or affording comforting warmth and shelter especially in a small space“a cozy nook near the fire”, “snug in bed”, “a snug little apartment”