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 certain rule, I call it a Green Word™. Use the following examples to find the rule:
$$ % set Title text. (spaces around the text ARE important; do not remove.) % increase Pad value only if your entries are longer than the title bar. % \def\Pad{\P{0.0}} \def\Title{\textbf{ Green }} % \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\ \def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words }^™\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2017.02.04}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \text{BASKETBALL}&\text{SOLITAIRE}\\ \hline \text{CATCH}&\text{APPRECIATE}\\ \hline \text{WEST}&\text{EAST}\\ \hline \text{NAME}&\text{AGE}\\ \hline \text{ATTACH}&\text{SPARE}\\ \hline \text{LOVE}&\text{CABRIOLETS}\\ \hline \text{ANARCHY}&\text{TITLE}\\ \hline \text{CRY}&\text{GLAD}\\ \hline \text{FLEXIBLE}&\text{OBJECT}\\ \hline \text{JOKER}&\text{LOLLIPOP}\\ \hline \end{array}$$