Pillar
noun
The kanji and the word are exactly the same. That means they share meanings as well.
はしら
You'll have to imagine a pillar standing tall, and made entirely of the Egyptian god Ra and hashbrowns. It is a hash-ra (はしら) pillar, made by the Egyptians who love breakfast.
そのスーパーで買い物をしてる間、私は犬を柱に繋ぐんですが、いつもちゃんと大人しく待ってますよ。
While shopping in the grocery store, I tether my dog to a pole and he always waits for me obediently.