dinner, diner

Dinner or dinner ( rhymes with winner ) means the evening meal--
What are we having for dinner?
I think I'll make meatloaf for dinner.
In an old-fashioned book, dinner may mean the noon meal--
They have dinner at noon and supper at six.

Diner or diner ( rhymes with minor )--means a small casual restaurant--
They like to go to the diner for breakfast on Saturday mornings.
The diner is open all night.
Diner may also mean someone who is eating dinner, particularly in a restaurant--
The diner jumped when he heard the crash.
Each diner in that restaurant gets a free slice of cake.

Now that you know that, you can say--
"Let's go to the diner for dinner."

Note--"dine" means to eat dinner--
We dine at 8.
They like to dine on pheasant and caviar.
Not to be confused with "din", which means an awful noise--
Quiet down! I can't hear the phone over the din!
The din was so awful they needed ear plugs.