When a word is a single kanji with no okurigana (hiragana attached to the kanji) it tends to use a kun'yomi reading. You didn't learn the kun'yomi reading when you learned the kanji itself, so let's use a mnemonic to remember the vocab word.
There's a woman in front of you. Who is she? She's the woman who lives on Ninth (おんな) Street!
Who is that woman?
I'm a woman.
I want a woman who will help look after my children.