It would be a female character who is the lead of their franchise (not a side kick or a female version of a male hero) with her own rogues gallery and has their own ongoing title. Technically, Marvel doesn't have a WW, even Carol is ultimately a female spin off of the male Captain Marvel, they just don't mention him nowadays but she is the one they're currently pushing as their female lead. WW has been consistently published till she reached 700 issues, the last time I checked the only other female hero who had an unbroken ongoing till they reached a 100 was the MC2 universe version of Spider-Girl/Mayday Parker. After that you have start adding up all the sporadic ongoings that She Hulk, Captain Marvel and Black Widow. I think Marvel is well aware of this weakness so they tend to overcompensate (especially in the era of diversity) but talking up how awesome their female roster are. Meanwhile, DC almost treats WW like a token they can put out to show how diverse they are but never really follow up on it. Currently, no female heroes outside of the Sup/Bat/WW sphere has any solo ongoings.
Either way, Carol has been the female lead of Marvel for the '10's and probably for most of the 20's as well. Good chance of Monica overtaking her if her MCU version becomes more popular. But until then, Carol is the lead, both in the comics, the MCU and even the EMH's cartoon that treated her with a certain reverences that I haven't see applied to WW.
I mean:
https://www.youtube.com/watch?v=GH70PjMPs2M [stopping the Hulk]
https://www.youtube.com/watch?v=ABVXFumiPFc [joining the Avengers]
https://www.youtube.com/watch?v=hW8A-6JSY-Y [managing to push back Galactus before getting defeated]
https://www.youtube.com/watch?v=1wTmu1nOlyY [Rallying the villains to help them fight against a bigger threat]
Compared to this, the best DC seem to be able to do with WW is to give her fight scenes (which I don't mind) but fall short on actual character development. Or as a love interest to Superman or Batman. Or show her jobbing to show powerful the latest threat is. Or just slapping on the 'Daughter of Zeus' label with no respect to her actual comic book history.