flatten vs roll out

flatten is not a noun while roll out is a noun.

Word	Noun	Adjective	Verb	Adverb
flatten	No	No	Yes	No
roll out	Yes	No	Yes	No

As verbs, roll out is a hyponym of flatten; that is, roll out is a word with a more specific, narrower meaning than flatten:

Other hyponyms of flatten include steamroll, steamroller, splat, roll, laminate.

flatten (noun)	roll out (noun)
	the act of officially distributing a new product or service to the public

flatten (verb)	roll out (verb)
become flat or flatter	flatten or spread with a roller
make flat or flatter	straighten by unrolling
lower the pitch of (musical notes)	to distribute systematically or strategically
	officially distribute a new product or service to the public