# What is a Coalescent Word™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles.

If a word conforms to a special rule, I call it a Coalescent Word™.
Use the examples below to find the rule.

$$% set Title text. (spaces around the text ARE important; do not remove.) % increase Pad value only if your entries are longer than the title bar. % \def\Pad{\P{0.0}} \def\Title{\textbf{ Coalescent }} % \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\ \def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words }^™\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2017.02.04}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \text{ AGHAST }&\text{ UNSURPRISED }\\ \hline \text{ ALABAMA }&\text{ MISSISSIPPI }\\ \hline \text{ BASS }&\text{ TREBLE }\\ \hline \text{ BLACK }&\text{ WHITE }\\ \hline \text{ JUSTIFIED }&\text{ UNWARRANTED }\\ \hline \text{ MADAME }&\text{ MONSIEUR }\\ \hline \text{ PROCESSED }&\text{ NATURAL }\\ \hline \text{ RUST }&\text{ OXIDIZE }\\ \hline \text{ STONED }&\text{ SOBER }\\ \hline \text{ SUPPORT }&\text{ SABOTAGE }\\ \hline \end{array}$$

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

Coalescent Words™,Not Coalescent Words™
AGHAST,UNSURPRISED
ALABAMA,MISSISSIPPI
BASS,TREBLE
BLACK,WHITE
JUSTIFIED,UNWARRANTED
PROCESSED,NATURAL
RUST,OXIDIZE
STONED,SOBER
SUPPORT,SABOTAGE


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

What is the special rule these words conform to?