or, oar, ore

Or or or means having a choice between one option and another, but not both--
Do you want pizza or burgers?
Do you want to go, or not?

Oar or oar ( rhymes with or ) means the thing used to row a boat or paddle a canoe--
Oh no! I dropped the oar. We'll have to try to get it out of the water, or we'll have trouble getting back.
I'm tired of rowing. You take the oar.

Ore or ore ( rhymes with or ) means a rock or deposit containing metal or minerals--
Iron ore is used to make steel.
The ore is smelted in a furnace to retrieve the metal.

Now that you know that, you can say--
"This ore contains silicon, which can be used to make an oar or a boat."

Note--"or", in heraldry, means gold--
The family crest was a lion on a field of  or.