comfortable vs cosy

comfortable is not a noun while cosy is a noun.

Word	Noun	Adjective	Verb	Adverb
comfortable	No	Yes	No	No
cosy	Yes	Yes	No	No

comfortable (noun)	cosy (noun)
	a padded cloth covering to keep a teapot warm

comfortable (adjective)	cosy (adjective)
providing or experiencing physical well-being or relief (`comfy' is informal)	enjoying or affording comforting warmth and shelter especially in a small space
free from stress or conducive to mental ease; having or affording peace of mind	suggesting connivance
in fortunate circumstances financially; moderately rich	having or fostering a warm or friendly and informal atmosphere
sufficient to provide comfort
having a wide margin