<sub>*In the spirit of the What is a [Word™](https://puzzling.stackexchange.com/search?q=%22I+call+it%22+title%3A%22what+is%22+title%3Aword+is%3Aquestion)/[Phrase™](https://puzzling.stackexchange.com/search?q=%22I+call+it%22+title%3A%22what+is%22+title%3Aphrase+is%3Aquestion) series started by [JLee](https://puzzling.stackexchange.com/users/463), a special brand of [Phrase™](https://puzzling.stackexchange.com/search?q=%22I+call+it%22+title%3A%22what+is%22+title%3Aphrase+is%3Aquestion+user%3A463) and [Word™](https://puzzling.stackexchange.com/search?q=%22I+call+it%22+title%3A%22what+is%22+title%3Aword+is%3Aquestion+user%3A463) puzzles.*</sub>

<hr>

If a word conforms to a special rule, I call it a ***Useful Word™***.  
Use the examples below to find the rule.  

$$
% set Title text. (spaces around the text ARE important; do not remove.)
% increase Pad value only if your entries are longer than the title bar.
%
\def\Pad{\P{0.0}}  \def\Title{\textbf{ Useful }}
%
\def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}}
\def\T{\Title\textbf{Words}^{\;\!™}\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle
\smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2019.05.15}\S{6px}{0}
\begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}}
\begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline
%
\text{  ALL             }&\text{        ANY             }\\ \hline
\text{  NEAR            }&\text{        AT              }\\ \hline
\text{  BORROW          }&\text{        BEG             }\\ \hline
\text{  CURSE           }&\text{        BLESS           }\\ \hline
\text{  SNITCH          }&\text{        BLUDGER         }\\ \hline
\text{  CANER           }&\text{        CANNER          }\\ \hline
\text{  REBS            }&\text{        DEBS            }\\ \hline
\text{  LIGHTEST        }&\text{        GRAVEST         }\\ \hline
\text{  SUPPED          }&\text{        LUNCHED         }\\ \hline
\text{  DIAMOND         }&\text{        MOD             }\\ \hline
\text{  AND             }&\text{        NOR             }\\ \hline
\text{  COVERT          }&\text{        OVERT           }\\ \hline
\text{  QUAYS           }&\text{        PIERS           }\\ \hline
\text{  GREEN           }&\text{        RED             }\\ \hline
\text{  OTHERS          }&\text{        SELF            }\\ \hline
\text{  GAMBLE          }&\text{        WAGER           }\\ \hline
\text{  BLACKEST        }&\text{        WHITEST         }\\ \hline
\end{array}$$

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

    Useful Words™,Not Useful Words™
    ALL,ANY
    NEAR,AT
    BORROW,BEG
    CURSE,BLESS
    SNITCH,BLUDGER
    CANER,CANNER
    REBS,DEBS
    LIGHTEST,GRAVEST
    SUPPED,LUNCHED
    DIAMOND,MOD
    AND,NOR
    COVERT,OVERT
    QUAYS,PIERS
    GREEN,RED
    OTHERS,SELF
    GAMBLE,WAGER
    BLACKEST,WHITEST

The puzzle satisfies the series' inbuilt assumption, that each word can be tested for whether it is a Useful Word™ without relying on the other words.  
These are not the only examples of Useful Words™; many more exist.

**What is the special rule these words conform to?**

&nbsp;

&nbsp;


**&mdash;HINTS&mdash;**  

*helpfulness level 0:*  
>! The name fits here, technically; a different name might have been more appropriate.

*helpfulness level 1:*  
>! There are *way* more Useful Words™ than Not Useful Words™.