...Because while all super powers are quirks, not all quirks are, to put it bluntly, [Not that she's ever Not blunt, really] 'powers'.

For example, someone might have a quirk that makes them resemble a cat, but they don't have any abilities beyond that. Another might be able to grow their hair a lot.

What makes a power is how much someone trains with it. Until then, it's just a 'quirk'-something that makes you unique, right?