pattern - What is a Spaced Out Word™?

This is my first try at a puzzle, so hopefully it at least lasts a few hours before someone figures it out :)

_{This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.}

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

UPDATE:

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).

ADDITIONAL WORDS

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)

Answer

The solution is that Spaced Out Words™ contain the letters for

Homonuclear gases at room temperature.

Word™ Element
----------------------------
HUMILIATE HELIUM

HEXAGONALLY OXYGEN
DUNGEON NEON
NEFARIOUSLY FLUORINE
NONSPHERICAL CHLORINE
WOOZINESS OZONE.
PRECOGNITION NITROGEN
EXTENSION XENON
AROUSING ARGON
ADJOURN RADON
POVERTYSTRICKEN KRYPTON

UNCOPYRIGHTED HYDROGEN