The word ezer is used only in twenty other places in the entire Old Testament. And in every other instance the person described is God Himself, when you need him to come through for you desperately.
There is no one like the God of Jeshurun, who rides on the heavens to help you…
Blessed are you, O Israel! Who is like you, a people saved by the LORD? He is your shield and helper and your glorious sword. (Deut. 33:26, 29)
I lift up my eyes to the hills—where does my help come from? My help comes from the LORD, the Maker of heaven and earth. (Ps. 121:1-2)
May the Lord answer you when you are in distress; may the name of the God of Jacob protect you. May he send you help.
We wait in hope for LORD; he is our help and our shield. (Ps. 33:20)
O house of Israel, trust in the LORD—he is their help and shield.
O house of Aaron, trust in the LORD—he is their help and shield.
You who fear him, trust in the LORD—he is their help and shield. (Ps. 115:9-11)
Most of the contexts are life and death, by the way, and God is your only hope. Your ezer. If he is not there beside you… you are dead. A better translation therefore of ezer would be “lifesaver”. Kenegdo means alongside, or opposite to, a counterpart.