Mother
Mom
noun
This word begins with an honorific (お), which generally adds a nuance of respect or politeness to what comes after it. Then there's 母, which you know means mother. Lastly, we have the honorific name-ender さん. So this is a nice way to say mother. You use it when talking about the moms of friends or casual acquaintances, when talking about your own mom in a casual social setting, or when talking to your own mom.
In more formal settings, you'll want to use 母 (pronounced はは) to talk about your own mom and the super respectful お母さま to talk about someone else's mom.
Since this word is made up of a single kanji, it uses the kun'yomi reading. You have to remember the かあ portion. Here's a mnemonic to help you to remember it:
What does your super nice mother do for you (this is why you're so polite to her!)? She drives you all around in her car (かあ) taking you wherever you need to go... soccer, kendo, whatever. What a nice mother you have!
お母さんがする
Mother does something
お母さんがくれる
Mother gives something
お母さんがいる
Mother's there
お母さんになる
to become a mother
お母さんに言う
to tell Mother
お母さんにもらう
to receive something from Mother
お母さんの心
Mother's heart
お母さんのおなか
Mother's stomach
お母さんの手
Mother's hand
お母さんはどこ？
Where’s mom?
うちのお母さん、いつもケールダイエットしてるんです。
My mother is always on a kale diet.
あ、お母さんからLINEだ。
Oh, I got a LINE message from my mom.