blastoff

is likely misspelled.

has no English definition.

As a noun blastoff

is the countdown and launch of a rocket, missile or spacecraft.

As nouns the difference between blastoff and blast

is that blastoff is the countdown and launch of a rocket, missile or spacecraft while blast is (violent gust of wind)A violent gust of wind.

As a verb blast is

to confound by a loud blast or din.

As an interjection blast is

blast it; damn it.

As nouns the difference between liftoff and blastoff

is that liftoff is the point in the launch of a rocket or an aircraft where it leaves contact with the ground while blastoff is the countdown and launch of a rocket, missile or spacecraft.

As nouns the difference between blastoff and blastoff

is that blastoff is the countdown and launch of a rocket, missile or spacecraft while blastoff is the countdown and launch of a rocket, missile or spacecraft.