Learn English – How to describe a dish that is both salty and sweet

My mouth is on fire!!

Is a phrase that is commonly heard in Mexican, Indian, and Thai restaurants worldwide.

Help !!..My Mouth Is On Fire !! 1

What To Do When Your Mouth’s On Fire From Red Hot Chili Peppers 2

Ya, just ate something spicy and my mouth is on fire. I tried drinking water and that didn't help. I also tried orange juice, and that didn't help. 3

There are no exact synonyms expect where stipulated (say in the sciences).

But treaty and pact are vague enough and overlap in meaning enough that they can easily be swapped in many contexts.

Did I mention that dictionaries aren't perfect either. That is constraint of dictionary writing, one may have limits on the length of a definition and nuances one can state (even the OED has some constraints, though fewer than most).

A treaty is an agreement between nations, either enemies or allies. It is written and authorized and ratified by both/all sides. Sometimes for variation, it might be nice to call this a pact between the nations.

A pact is a little more loose. I can make a pact with a friend of mine to always meet on New Years Day. But to call that a treaty would be wrong. If I made a similar arrangement with a person who is not my friend, say the owner of a competing business to informally discuss avoiding encroaching on the others business, that might be metaphorically called a treaty, but pact would work better.