What is a Target 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 a Target Word™.
Use the following examples below to find the rule.

$$% set Title text. (spaces around the text ARE important; do not remove.) % increase Pad value only if your entries are longer than the title bar. % \def\Pad{\P{0.0}} \def\Title{\textbf{ Target }} % \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words}^{\;\!™}\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2019.05.15}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \text{ TELL }&\text{ SAY }\\ \hline \text{ BOIL }&\text{ POACH }\\ \hline \text{ TARD }&\text{ LATE }\\ \hline \text{ BLINK }&\text{ WINK }\\ \hline \text{ JOB }&\text{ TASK }\\ \hline \text{ ARGS }&\text{ PARAMS }\\ \hline \text{ GRATE }&\text{ GRIND }\\ \hline \text{ OIL }&\text{ WATER }\\ \hline \text{ NILE }&\text{ GANGA }\\ \hline \text{ JOIN }&\text{ LEAVE }\\ \hline \end{array}$$

And, if you want to analyze, here is a CSV version:

Target Words™,Not Target Words™
TELL,SAY
BOIL,POACH
TARD,LATE
ARGS,PARAMS
GRATE,GRIND
OIL,WATER
NILE,GANGA
JOIN,LEAVE


Hint 1:

A Target Word is:

A word whose letters can be found sequentially on a regulation dartboard whose numbers have been converted into A1Z26. Acceptable moves between letters/numbers include (1) moving to the next letter/number clockwise, (2) moving to the next letter anti-clockwise, (3) moving through the bullseye to the letter/number directly opposite, and (4) staying on the same letter/number for a second use.

The usual arrangement for such an object is (clockwise from top):

20 - 1 - 18 - 4 - 13 - 6 - 10 - 15 - 2 - 17 -
3 - 19 - 7 - 16 - 8 - 11 - 14 - 9 - 12 - 5, then back to 20.

Which translates to:

T - A - R - D - M - F - J - O - B - Q -
C - S - G - P - H - K - N - I - L - E, then back to T.

All the listed words can be found via this method:

TARD, JOB and NILE are found clockwise.
TELL is found anti-clockwise.
BOIL, OIL and JOIN are made by leaping across the bull from O to I.
BLINK is made by leaping across the bull from B to L.
ARGS is made by leaping across the bull from R to G.
GRATE is made by leaping across the bull from G to R.

As for the name:

In darts, the dartboard is the TARGET.

And the clue...

A 'white horse' is a darts term in the 'Cricket' variant of the game, when a player hits 3 different scoring trebles with their first set of 3 darts...

• You also done a "hat trick", like the horse in the photo :P – Conifers Aug 14 '19 at 8:40
• @Conifers Ha, I suppose I have! – Stiv Aug 14 '19 at 15:36