This is based on the What is a Word/Phrase™ series of Phrase™ and Word™ puzzles, started by JLee.
If a word follows a certain rule, then I call it a Powerful Word™. If it violates this rule, then it is not a Powerful Word™.
Use the example word lists below to find the rule.
Powerful Word™, Not Powerful Word™
DIRECTORSHIP, INTELLECT
MONUMENTALISM, WIDTH
ACE, KING
FADE, DISAPPEAR
NONPRODUCTIVITY, ROT
GAFFE, ABERRATION
BEHELD, OBSERVED
ANNIHILATOR, BUILDER
ICEBERG, WHIRLPOOL
RELIABLE, UNSTOPPABLE
ZERO, INFINITY
PREDICATE, SUBJECT
RESEARCHER, SCIENTIST
COUNTERCULTURE, FOLK
OAK, REDWOOD
Each word can be tested for whether it is a Powerful Word™ without depending on other words.