# What is a 255b Word™?

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 255b Word™.
Use the following examples below to find the rule.

$$% set Title text. (spaces around the text ARE important; do not remove.) % increase Pad value only if your entries are longer than the title bar. % \def\Pad{\P{2.5}} \def\Title{\textbf{ 255b }} % \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words}^{\;\!™}\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[grey]{\phantom{\rlap{rubio.2019.05.15}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \text{ AMBIGUOUSLY }&\text{ AMBITIOUSLY }\\ \hline \text{ BOXING }&\text{ BOXER }\\ \hline \text{ COMPLICATE }&\text{ COMPLEX }\\ \hline \text{ DECENTRALIZE }&\text{ DECENTRALIZATION }\\ \hline \text{ ENTERTAINMENT }&\text{ EXCITEMENT }\\ \hline \text{ FINALLY }&\text{ FINISHED }\\ \hline \text{ GEOGRAPHY }&\text{ GEOLOGY }\\ \hline \text{ HENRY }&\text{ HIGUAIN }\\ \hline \text{ INDICATION }&\text{ INCLINATION }\\ \hline \text{ JUXTAPOSING }&\text{ JUXTAPOSITION }\\ \hline \text{ KNOWLEDGE }&\text{ KNOWLEDGEABLE }\\ \hline \text{ LIGHTNING }&\text{ LIGHTENING }\\ \hline \end{array}$$

And, if you want to analyze, here is a CSV version:

255b Words™,Not 255b Words™
AMBIGUOUSLY,AMBITIOUSLY
BOXING,BOXER
COMPLICATE,COMPlEX
DECENTRALIZE,DECENTHALIZATION
ENTERTAINMENT,EXCITEMENT
FINALLY,FINISHEO
GEOGRAPHY,GEOLORY
HENRY,HIGUAIN
INDICATION,INCLINATION
JUXTAPOSING,JUXTAPOSITION
KNOWLEDGE,KNOWLEDgEABLE
LIGHTNING,LIGHTENING


The puzzle satisfies the series' inbuilt assumption, that each word can be tested for whether it is a 255b Word™ without relying on the other words. These are not the only examples of 255b Words™; many more exist.

Problem: What is a 255b Word™? And why is the property called 255b?

Hint:

This rule is actually quite arbitrary. I don't think you can read my mind without the tag.

• Is the CSV misspelled? ("DECENT'H'ALIZATION" with 'H' in CSV, but with 'R' in the table) Is CSV purposely not fully capitalized? (such as 'g' in "KNOWLED'g'EABLE" and 'l' in "COMP'l'EX") – Vepir Dec 22 '19 at 18:14
• @Vepir Yeah, I deliberately misspelled a few letters in CSV. :) – r_64 Dec 23 '19 at 1:55
• are both lists correct? – Jasen Dec 28 '19 at 23:35
• @Jasen Yes, both are correct. – r_64 Dec 31 '19 at 2:46