cosy vs comfy

cosy is a noun but comfy is not a noun.

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

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

cosy (adjective)	comfy (adjective)
enjoying or affording comforting warmth and shelter especially in a small space	providing or experiencing physical well-being or relief (`comfy' is informal)
suggesting connivance
having or fostering a warm or friendly and informal atmosphere