In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles.
Template taken from Rubio.
[A break from the Piece de Resistance series, another one of the series will be posted hopefully within one day.]
Well, this question does not ment to inspire your thinking, but rather an enticement to your recollections in the childhood, given the title is a FAQ, especially when you ask "Is *** a swear word?" to your parents. humor can be added if you want. Have fun :-)
If a word conforms to a special rule, I call it a Swear Word™.
Use the following examples below to find the rule.
$$ % set Title text. (spaces around the text ARE important; do not remove.) % increase Pad value only if your entries are longer than the title bar. % \def\Pad{\P{0.0}} \def\Title{\textbf{ Swear }} % \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words}^{\;\!™}\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2019.05.15}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \text{pens}&\text{pencils}\\ \hline \text{crap}&\text{excrement}\\ \hline \text{swear}&\text{oath}\\ \hline \text{hell}&\text{netherworld}\\ \hline \text{bloody}&\text{sickly}\\ \hline \text{seamen}&\text{sailors}\\ \hline \text{bad}&\text{wicked}\\ \hline \text{good}&\text{beneficial}\\ \hline \text{gender}&\text{sex}\\ \hline \text{ardour}&\text{lust}\\ \hline \text{focus}&\text{fetus}\\ \hline \text{love}&\text{passion}\\ \hline \text{hungry}&\text{Hungary}\\ \hline \text{pure}&\text{purity}\\ \hline \end{array}$$
Well, remember to explain the title as well! Have fun!
Hints:
usefulness level 1
The relation required has nothing to do with the meanings of the words