The article about “bhikkhave” is an understandable attempt, but if you look at who the Buddha actually talks to in the suttas it’s overwhelmingly monks. Sometimes laymen, sometimes laywomen (or non- Buddhists such as brahmins or Jains), but almost never nuns (there’s one passage in the SN where he speaks to 500 unnamed nuns I believe, and that’s it). I short, it seems that “bhikkhu” means “monk.”
So, we should assume that the Buddha ordained women or had women ordained, but left the teachings to monks? Or, expected them to teach each other?
Hmmm… I’m not sure I’d have loved to get ordained.