This is my first try at a puzzle, so hopefully it at least lasts a few hours before someone figures it out :)
If a word conforms to a special rule, I call it a Spaced Out Word™.
Use the following examples below to find the rule.
And, if you want to analyze, here is a CSV version:
Spaced Out Words™,Not Spaced Out Words™ HUMILIATE,DEGRADE HEXAGONALLY,OCTAGONALLY DUNGEON,CATACOMB NEFARIOUSLY,HEINOUSLY NONSPHERICAL,NONCUBIC WOOZINESS,DIZZINESS PRECOGNITION,CLAIRVOYANCE EXTENSION,ANNEX
It occurred to me that, even if a puzzler were to reverse-engineer my criteria from the words above, they may not be able to fully determine the rules. To help, here are some additional words that are Not Spaced Out Words™ to narrow down the criteria:
CELEBRATION WEATHERMEN MANIPULATING ADORINGLY
It's less of a hint and more of a clarification, but I put them in spoiler text for those who may want to solve the puzzle as it was originally written (and maybe refer back to these after, for verification).
Below are a few more Spaced Out Words™ and Not Spaced Out Words™:
Spaced Out Words™,Not Spaced Out Words™ AROUSING,EXCITING ADJOURN,RECESS
And a few more if you need more. I think this just about exhausts the list...
Spaced Out Words™,Not Spaced Out Words™ POVERTYSTRICKEN,IMPOVERISHED UNCOPYRIGHTED,PUBLICDOMAIN(yes, that last Not Spaced Out Word™ is technically two words)