I'm interested in finding English words that, when any one letter is removed, the result is still a valid, correctly-spelled English word. For example, the word "SPAY" is an example of such a word, as "PAY" "SAY", "SPY", and "SPA" are also words. I have an example of a five-letter word, but I'm interested to see what others come up with!
It seems you are looking for
A versatile word. That post contains several examples such as BOATS and LOOPS. A 6 letter example is also given: SHOOTS.
I wrote some code to identify all such words, using the CSW21 Scrabble lexicon as my dataset. The longest such word is six letters long; all five and six-letter examples are bolded in the list below.
AAH AAHS AAL AALS AAS ABA ABAS ABY ABYS AGAS AHA AHI AHIS AID AIDS AIN AINS AIS AIT AITS ALA ALAS AMA AME AMI ANA ANAS ANE ANIS ANY ARE ASH ATE AWE AYE BAA BAAL BAALS BAAS BAE BAY BAYE BAYES BAYS BEE BEEN BIO BIOS BOAR BOARS BOAT BOATS BOI BOIS BOO BOOH BOOHS BOON BOOR BOOS BOOT BOOTS BORA BOY BOYS BROO BROOS BYE BYES COOMS COON COONS COOP COOPS COOS COOT COOTS DAE DEARN DEARNS DEE DEEN DOE DOO DOOM DOOMS DOON DOOR DOOS EAN EANS EAR EARS EAS EAT EEL EEN EEW EME ENE ERAS ERE EST ETA EWE FAA FAAS FAE FAY FEE FEEN FOUR FRAY GIO GIOS GLEED GOAT GOO GOON GOONS GOOR GOOS HAE HAM HAUNT HEARD HEARDS HEM HMM HMMM HOE HOES HOI HOIS HOM HOO HOON HOOP HOOT ION IONS IOS ISO KAI KAINS KAIS KAY KOI KOIS LEAST LEAT LEATS LEEK LOO LOOP LOOPS LOOR LOOS LOOT LOOTS LOUD LOUR MAA MAAS MAE MAM MANA MANAS MAY MEE MEM MMM MOAT MOATS MOE MOES MOI MOIL MOM MOO MOON MOONS MOOP MOOPS MOOR MOOS MOOT MOOTS MOU MOUS MOY MUM MUMM NAE NAY NAYS NEE NOO NOON NOY NOYS NYE OBE OBES OBI OBIS OBO OBOS ODE OES OHM OHO OIS ONE ONO ONOS ONY OOF OOH OOHS OOM OOMS OON OONS OOP OOPS OOR OOS OPE OPES ORE ORES OUDS OUP OUPS OUR OUS OWE OYE OYES PAINS PAIRS PAWN PAWNS PEA PEAN PEANS PEAR PEAS PEAT PEATS PEE PEEL PEELS PEEN PERE PEST PHOT POI POIS POO POOH POOHS POONS POOP POOPS POOS POOT POOTS POWNS PREE PROO PROOF RAID RAIDS RAIN RAIT RAITS REE REEN ROOM ROOMS ROOT ROOTS SAIM SAIMS SAIN SAINS SAIR SAIRS SARIS SEAN SEANS SEAR SEARS SEAT SEEL SEELS SEEN SHAY SHO SHOOT SHOOTS SIT SKEEN SNEED SOH SOUP SOUPS SOUS SPARED SPAY SYEN TAE TAI TAIN TAINS TAIS TAIT TAITS TARES TASK TASKS TEA TEAS TEAT TEATS TEE TEEL TEELS TEEN TOE TOO TOOM TOON TOOT TORES TREES UMM WAIN WAINS WAIS WAIT WAITS WARY WEE WEELS WEEN WOE WOO WOOF WOOFS WOON WOONS WOOS WOOT YAE YEA YEAR YEARD YEARDS YEAS YOU YOUK YOUKS ZEA ZEE ZOO ZOOS
The only six-letter words here are DEARNS, HEARDS, SHOOTS, and SPARED.