flatten vs steamroll

flatten and steamroll both are verbs.

Word	Noun	Adjective	Verb	Adverb
flatten	No	No	Yes	No
steamroll	No	No	Yes	No

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

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

flatten (verb)	steamroll (verb)
become flat or flatter	make level or flat with a steamroller
make flat or flatter	overwhelm by using great force
lower the pitch of (musical notes)	proceed with great force
	bring to a specified state by overwhelming force or pressure