Does boastful means the same as broil?

No, boastful and broil do not mean the same thing.

Boastful is an adjective that means "excessively proud of or talking about one's own achievements or qualities".

>Example: The athlete was criticized for being too boastful during his victory speech.

Broil is a verb that means "to cook (food) by direct heat, typically under or over a flame or in a very hot oven".

>Example: The steak was broiled to perfection.