If a phrase adheres to a certain rule, then I call it a Count Word™.
Use the examples below to find the rule.
In case you want it in CSV:
Count Words™, Not Count Words™ GUNK, TRASH TRIFLE, TOFFEE ADD, SUB CLIFF, VALLEY GYM, LAZE WOW, MEH BAD, GOOD FLIER, POSTER EXCITE, IMPRESS HAHA, LOL FLIRT, CREEP MUSK, MELON RELIC, MONK SKY, SEA SUNNY, WINDY FILTER, HASHTAG
The puzzle relies on the series' inbuilt assumption, that each word can be tested for whether it is a Count Word™ or not on its own.
I shall be giving 10 hints periodically if the puzzle isn't solved soon