If a word has a certain property, I call it an Alpha Word™. Based on the following list, determine the rule governing if a word is an Alpha Word™.
Alpha Words Not Alpha Words AND AN BIOLOGY APPLE CODE AUTHORS CONCEPTUAL BASKETBALL FANS BUT INFORMATION CODED LAW CYTOPLASM LEVEL DESPITE LITERATE GOLF MINING LIFESTYLE MOVIE MACROECONOMICS PASSIONATE MEDIA POWER PICTURESQUE RELATED REALISTIC SERIOUS SEVERANCE SYSTEM SIGNAL THOSE SYNERGY TRAIN THULIUM WARRIORS VITAL WISH XYLOPHONE
Because the classifications of some of these words may change over time, it should be noted that this challenge was written on December 4, 2015.
"FOR" demonstrates itself as an Alpha Word very much.
Alpha Words are not Beta Words.
If you are reading this, you are exactly one click away from finding the rule in this challenge. Want to use your click on this?
Hint 5 (makes this much easier)
You are also one click away from finding all of the Beta words.