cozy vs informal

cozy is a noun but informal is not a noun.

Word	Noun	Adjective	Verb	Adverb
cozy	Yes	Yes	No	No
informal	No	Yes	No	No

As adjectives, cozy and informal are synonyms defined as:

cozy and informal: having or fostering a warm or friendly and informal atmosphere

Other synonyms of cozy include cosy, intimate.

cozy (noun)	informal (noun)
a padded cloth covering to keep a teapot warm

cozy (adjective)	informal (adjective)
suggesting connivance	not formal
enjoying or affording comforting warmth and shelter especially in a small space	used of spoken and written language
having or fostering a warm or friendly and informal atmosphere	having or fostering a warm or friendly and informal atmosphere
	not officially recognized or controlled