# What is a Useful Word™?

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, I call it a Useful Word™.
Use the examples below to find the rule.

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

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?

—HINTS—

The name fits here, technically; a different name might have been more appropriate.

There are way more Useful Words™ than Not Useful Words™.

This is likely impossible to solve unless you start with the right words.

• My "brain" is not a useful word for determining the solution to this puzzle. May 15 '19 at 23:18
• Perhaps a helpfulness Level 7 hint? :p May 21 '19 at 11:37
• Does this, perchance, have something to do with the age or relevance of the words? May 21 '19 at 13:26
• @nine9 I don’t know the age of any of these words. I don’t know what you mean by relevance (to what?)
– Rubio
May 21 '19 at 14:02
• Something I find interesting is that the Not Useful™ words are all in alphabetical order, unlike Useful™ words; that might (or might not) mean they are found by filtering a dictionary automatically. The list also ends at the letter W that is fairly close to the end of the alphabet, so these might even (or might not) be the only Not Useful™ words. May 21 '19 at 15:06

A Not Useful Word™ is a word that...

...can have "one" added somewhere within it to make a new word:

ANY => ANYONE
AT => ATONE
BEG => BEGONE
BLESS => BONELESS
BLUDGER => BLUDGEONER
CANNER => CANNONEER
DEBS => DEBONES
GRAVEST => GRAVESTONE
LUNCHED => LUNCHEONED
MOD => MOONED
NOR => NOONER
OVERT => OVERTONE
PIERS => PIONEERS
RED => REDONE
SELF => ONESELF
WAGER => WAGONEER
WHITEST => WHITESTONE

As for the name Useful Word™...

...Rand al'Thor figured that out in a comment below:

The idea behind the name seems to be based on the downvote tooltip on Stack Exchange. You give minus one for an answer that's not useful, hence "not useful" for a word which, when ONE is 'subtracted', is still meaningful.

• -1 "This answer is not useful" ;)
– Rubio
May 23 '19 at 14:58
• @gnovice (I've just given you a rather gigantic hint)
– Rubio
May 23 '19 at 15:39
• @gnovice The idea behind the name seems to be based on the downvote tooltip on Stack Exchange. You give minus one for an answer that's not useful, hence "not useful" for a word which, when ONE is 'subtracted', is still meaningful. May 23 '19 at 16:07
• @Randal'Thor: Ahhh, totally missed the hint. That's surely the answer. May 23 '19 at 16:19
• Oooh, clever. I'll go ahead and award the bounty. May 23 '19 at 16:50