I have to admit that I totally forgot that there were two different ways to spell the word stationary — yep, that’s right.

Stationary means to be still

Stationery is what you write on.

Then, that got me thinking… and for now the only other words I can think that are similar to this are principle/principal

Principle is like a rule, or code of conduct.

Principal is the head of a school.

I’m sure there are many others, and this isn’t the most gramatically correct posts… the weird things we writers learn!