takeaway

As an adjective takeaway is

(chiefly|uk|australia|and|new zealand|of food) to be eaten off the premises.

As a noun takeaway is

(chiefly|uk|australia|and|new zealand) a restaurant that sells food to be eaten elsewhere.

Fastfood is likely misspelled.

Fastfood has no English definition.

As an adjective takeaway

is to be eaten off the premises.

As a noun takeaway

is a restaurant that sells food to be eaten elsewhere.

As nouns the difference between takeaway and giveaway

is that takeaway is a restaurant that sells food to be eaten elsewhere while giveaway is something that is given away or handed out for free.

As an adjective takeaway

is to be eaten off the premises.