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, we call it a BORE Word™. Use the examples below to find the rule.
$$\begin{array}{|c|c|}\hline \bbox[yellow]{\textbf{BORE Words™}} & \bbox[yellow]{\textbf{Not BORE Words™}}\\\hline \text{ANT} & \text{SPIDER}\\\hline \text{ENVY} & \text{JEALOUSY}\\\hline \text{FLAP} & \text{FLUTTER}\\\hline \text{FUR} & \text{HAIR}\\\hline \text{GREEN} & \text{BLUE}\\\hline \text{IRK} & \text{RILE}\\\hline \text{ONE} & \text{TWO}\\\hline \text{ONYX} & \text{GEM}\\\hline \text{REEF} & \text{CORAL}\\\hline \text{ROOF} & \text{FLOOR}\\\hline \text{TANG} & \text{ZEST}\\\hline \end{array}$$
What is a BORE Word™?
