fieriness

As nouns the difference between fieriness and blaze

is that fieriness is the quality of being fiery while blaze is a fire, especially a fast-burning fire producing a lot of flames and light.

As a verb blaze is

to be on fire, especially producing a lot of flames and light.

As nouns the difference between fire and fieriness

is that fire is a (usually self-sustaining) chemical reaction involving the bonding of oxygen with carbon or other fuel, with the production of heat and the presence of flame or smouldering while fieriness is the quality of being fiery.

As a verb fire

is to set (something) on fire.