roil vs boil

roil is not a noun while boil is a noun.

Word	Noun	Adjective	Verb	Adverb
roil	No	No	Yes	No
boil	Yes	No	Yes	No

As verbs, roil and boil are synonyms defined as:

Other synonyms of roil include churn, moil.

roil (noun)	boil (noun)
	the temperature at which a liquid boils at sea level
	a painful sore with a hard core filled with pus

roil (verb)	boil (verb)
make turbid by stirring up the sediments of	immerse or be immersed in a boiling liquid, often for cooking purposes
be agitated	come to the boiling point and change from a liquid to vapor
	bring to, or maintain at, the boiling point
	be in an agitated emotional state
	be agitated