An entry into the 20th fortnightly topic challenge.
If a word conforms to a certain rule, I call it a Flawless Word™. Use the following examples to find the rule:
Here is a CSV:
Flawless Words™,Non-Flawless Words™ CADDIE,GOLFER DOG,CAT EFFACE,APPEAR HIDE,SEEK MAGE,FIRE BEAR,WOLF DEICE,WATER GAME,WORK HEAL,HARM TEA,PEA ALGAE,OCEAN
The puzzle relies on the series' inbuilt assumption, that each word can be tested for whether it is a Flawless Word™ on its own.
These are not the only examples of Flawless Word™ (or non-Flawless Word™), more can be found.