okay lets think of it this way.

her as a spider woman, venom in their fangs every spider woman is able to do that cause venom can be a cocktail of drugs and that makes sense. an ability is common to your species 

however a fear is something that only your family has the ability to do. my fear is summoning my predecessors cause only my family has been able to summon their past supreme commanders to join them in battle. a fear is what you can do to strike fear into your enemies so me summoning the dead will scare the hell out of people hence a fear ability.

make sense?