Really enjoyed creating this kind of puzzle, here's another one.
If a word conforms to a special rule I call it an Elegant Word™
$$ % nonstandard template, do not copy elsewhere % \def\Pad{\P{0.0}} \def\Title{\textbf{ Elegant }} \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\ \def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words }^™\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2017.02.04}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \textsf{ VISCOUS }&\textsf{ FLUID }\\ \hline \textsf{ JOINING }&\textsf{ MERGING }\\ \hline \textsf{ PUBLIC}&\textsf{ PRIVATE}\\ \hline \textsf{ BIG}&\textsf{ TINY }\\ \hline \textsf{ MUSIC}&\textsf{ MOZART}\\ \hline \textsf{ GO}&\textsf{ STOP}\\ \hline \textsf{ DOZING }&\textsf{ WORKING}\\ \hline \hline \textsf{ SUCCUBUS} &\textsf{ SAINT}\\ \hline \textsf{ UNICORN}&\textsf{ HORSE}\\ \hline \hline \textsf{ POISON}&\textsf{ TOXIC}\\ \hline \end{array} $$
The CSV version: (it won't help this time)
Elegant Words™, Not Elegant Words™
VISCOUS, FLUID
JOINING, MERGING
PUBLIC, PRIVATE
BIG, TINY
MUSIC, MOZART
GO, STOP
DOZING, WORKING
SUCCUBUS, SAINT
UNICORN, HORSE
POISON, TOXIC
Can you tell me what the rule is?