# What is an F-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 an F-word™.

Use the examples below to find the rule.

$$\begin{array}{|c|c|}\hline \bbox[yellow]{\textbf{F-words™}} & \bbox[yellow]{\textbf{Not F-words™}}\\\hline \text{ABRACADABRA} & \text{APPLES}\\\hline \text{BALLS} & \text{BROWNIE}\\\hline \text{CORN} & \text{COOKIES}\\\hline \text{DABBING} & \text{DUCKY}\\\hline \text{ELMO} & \text{ELEVATOR}\\\hline \text{FABRIC} & \text{FURY}\\\hline \text{GAGGING} & \text{GORILLA}\\\hline \text{HAMMER} & \text{HANDWRITE}\\\hline \text{INDIGO} & \text{IZZIE}\\\hline \text{JEWEL} & \text{JOLLY}\\\hline \text{KISS} & \text{KICKING}\\\hline \end{array}$$

CSV Version:

F-words™,Not F-words™
BALLS,BROWNIE
DABBING,DUCKY
ELMO,ELEVATOR
FABRIC,FURY
GAGGING,GORILLA
HAMMER,HANDWRITE
INDIGO,IZZIE
JEWEL,JOLLY
KISS,KICKING


These are not the only examples of F-words™, many more exist.

Note:

I will add one row to this puzzle each day it remains unsolved, up to the letter Z.

• By the way, the word that is usually known as the "F-word" is an F-word™ :p – suomynonA Feb 6 '17 at 6:40
• Ferret, you mean, right? Or did you mean the really bad rude one ... fart?! – Rubio Feb 6 '17 at 8:12
• *gasps* $\!\!$ – suomynonA Feb 7 '17 at 2:14