success (n): succeed (v), successful (adj), successive (adj), succession (n).

VD: She is a successful businessman.

immediate (adj): immediately (adv).

VD: Please get out of here immediately or I will call the police.

imform (v): informal (adj), informality (n), information (n), informative (adj).

VD: Can you give me some information about that girl?

accommodate (v): accommodation (n), accommodating (adj).

VD: Is there any accommodation nearby?

luck (n): luckily (adv), luckiness (n), lucky (adj), luckless (adj).

VD: She is lucky to have bought an apartment in the center at a cheap price.

responsible (adj): responsibility (n), responsibly (adv), responsive (adj).

VD: In the house, my responsibilities are to wash the dishes, sweep the floor and do the laundry.

difficult (adj): difficulty (n).

VD: It is very difficult to know what to do for the best in this case.

prepare (v): prepared (adj), preparation (n), preparatory (adj).

VD: We are preparing for our trip to Japan tomorrow.

reason (n): reasonable (adj), reasonably (adv), reasonableness (n).

VD: The car is reasonably priced.