If a word conforms to a special rule, I call it a Refreshing Word™.
Use the following examples below to find the rule.
And here is a CSV version:
REFRESHING WORD™, UNREFRESHING WORD™ Hungrier, Hungriest Refreshing, Reforming Noon, Undeniable Unsung, Poop Deadly, Deathly Barbie, Nincompoop
Before you ask, it's not the fact that all the Refreshing Words™ have a pair of letters that are 2 characters apart; that was just there to throw you off. Think inside the box.