Two letter challenges:
BG - hobgoblin
BV - obvious
CM - acme
DQ - headquarters
FC - selfconscious
FW - halfway
GC - dogcart
GD - kingdom
GJ - logjam
GZ - zigzag
HH - hitchhiker, withhold
HK - latchkey
HQ - earthquake
IJ - hijinks
KC - bookcase
KG - blackguard
KJ - lockjaw
LJ - killjoy
LQ - milquetoast, catafalque
MD - humdrum
MQ - kumquat
PJ - flapjack
TJ - nightjar
TK - pocketknife
TV - outvote
UH - brouhaha
UQ - bouquet
VV - flivver, divvy, navvy
WW - powwow, bowwow
XF - foxfire
XG - foxglove
XN - laxness
XQ - exquisite
XS - coxswain
ZB - whizbang
ZK - blitzkrieg
ZM - gizmo
ZP - chutzpah
ZV - rendezvous
ZW - zwieback
Three letter challenges:
AFY - leafy
AIE - gaiety
AIQ - daiquiri
AKN - weakness
AKT - breaktime
AMT - dreamtime
ANW - meanwhile
AOH - pharaoh
AOT - chaotic
APK - napkin
ATG - catgut
AWG - lawgiver
BEK - unbeknownst
BFR - subfreezing
BOF - riboflavin
BOJ - turbojet
BPL - subplot
BPO - subpoena
BTF - doubtful
CAQ - macaque
CEC - facecloth
CEK - placekicker
CHG - beachgoer
CTY - dactyl
CYH - policyholder
CYO - halcyon
CZE - eczema
DDB - oddball
DDM - oddment
DEK - sidekick
DEQ - adequate
DHP - jodhpur
DSC - landscape
DSK - kidskin
DTE - midterm
DWR - headwrap
DYB - ladybug
DYG - bodyguard
DYM - readymade
EGW - legwork
EKD - weekday
EOI - geoid
ETD - letdown
EWG - gewgaw
EZA - jezabel
FEG - lifeguard
FEK - safekeeping
FSA - selfsame
FSI - offside
FTB - softball
FTT - ofttimes
GEC - stagecoach
GEF - dirgeful
GGN - eggnog
GGP - eggplant
GHG - thoroughgoing
GNP - signpost
GNT - sovereignty
GOC - egocentric
GSK - pigskin
HCR - witchcraft
HDI - archdiocese
HDU - archduke
HLR - kohlrabi
HMM - ohmmeter
HPL - birthplace
HPR - crushproof
HSH - roughshod
HSK - fishskin
HTC - nightcap
HTG - nightgown
HTM - nightmare
HYN - shyness
IAI - antiaircraft
IAU - semiautomatic
IDP - midpoint
IEI - dieing
IFA - multifarious
IJI - hijinks
IMF - brimful
IOA - radioactive
IOE - radioed
IOI - radioisotope
IOV - audiovisual
IPK - slipknot
IUT - prosciutto
IXF - sixfold
IZU - seizure
KAC - backache
KBL - inkblot
KCL - sackcloth
KEB - wakeboard
KSG - thanksgiving
KSK - buckskin
KSU - cocksure
KTR - backtrack
KUS - ruckus
KYC - skycap
KYR - skyrocket
LAL - slalom
LCL - sailcloth
LDB - goldbrick
LDT - oldtimer
LEK - telekinesis
LEQ - harlequin
LFL - halflife
LIH - likelihood
LKH - bulkhead
LML - calmly
LNO - malnourished
LPF - helpful
LPL - helpless
LSC - fullscreen
LTC - saltcellar
LTP - saltpeter
LYD - bellydance
LYF - bellyful
LYV - polyvalent
MBB - dumbbell
MBN - numbness
MBP - bombproof
MCH - claimcheck
MEU - comeuppance
MKH - gymkhana
MND - damndest
MNL - hymnlike
MPF - campfire
MPG - campground
MPM - jumpmaster
MPP - lamppost
MSK - numskull
MSM - groomsmen
MSP - circumspect
MSU - swimsuit
MVE - circumvent
MWI - dimwit
NDD - granddad
NDJ - windjammer
NDK - grandkid
NGN - wingnut
NKG - ginkgo
NKM - embankment
NNK - innkeeper
NSW - answer
NYH - anyhow
NYP - anyplace
OAB - doable
OAU - coauthor
OAV - loaves
OEQ - coequal
OEU - indoeuropean
OHO - nohow
OHY - carbohydrate
OIE - moiety
OKC - bookcase
OUA - bivouac
OUQ - bouquet
OWU - blowup
OYH - boyhood
OYO - yoyo
OYR - joyride
PEV - grapevine
PIF - typify
PIU - opium
PFR - leapfrog
PPH - sapphire
PSF - cupsful
PSM - corpsman
PSP - topspin
PTC - bankruptcy
PYC - copycat
PYW - copywriter
RDP - hardpan
RDV - aardvark
RFD - serfdom
RJU - perjury
RLH - girlhood
RMC - armchair
RMP - armpit
RNH - cornhole
RPM - escarpment
RSB - hairsbreadth
RTG - mortgage
RYD - drydock
SDR - crossdress
SHH - fishhook
SIQ - physique
SKR - muskrat
SPB - raspberry
SSK - passkey
SUO - sensuous
SYW - pussywillow
TBL - bootblack
THC - healthcare
THT - bathtub
TIK - batik
TIW - antiwar
TMU - litmus
TOZ - protozoan
TYD - katydid
UAH - quahog
UDB - cloudburst
UDU - kudu
UEO - aqueous
UFA - manufacture
UMD - humdrum
UXU - luxury, uxurious
VEF - wavefront
VEP - stovepipe
VEW - driveway
VYH - heavyhanded
VYS - heavyset
WAW - stowaway
WFE - crowfeet
WKW - awkward
WND - downdraft
WNM - disownment
WNP - downplay
WNU - grownup
WSB - newsbreak
WSM - newsman
WSW - newsworthy
XAD - hexadecimal
XIB - flexible
XOP - saxophone
XTB - textbook
XYE - epoxyed
XYM - oxymoron
XYS - paroxysm
YAG - voyage
YEB - eyebrow
YFR - bayfront
YHA - mayhaw
YNG - laryngectomy
YOE - kayoed
YRD - martyrdom
YSC - payscale
YSL - dyslexia
YSY - polysyllabic
YUN - picayune
YZY - syzygy
ZEF - prizefight
Four letter challenges:
AIRV - clairvoyant
CEBE - iceberg
DEZV - rendezvous
DROB - wardrobe
ECIB - decibel
ELEL - ukelele
EPHY - zephyr
ERYO - everyone
EWHA - somewhat
EYSE - geyser
FELE - lifeless
FODI - daffodil
FRAR - infrared
GHAG - roughage
GUAG - language
HEMU - chrysanthemum
HHOO - fishhook
HIPE - archipelago
NHIQ - technique
HTEE - eighteen
KADA - lackadaisical
LECU - molecule
LESL - coleslaw
LLJO - killjoy
LSEL - falsely
IKEA - likeable
ITCA - suitcase
LYLY - slyly
MBBE - dumbbell
MECA - namecalling
MEON - someone
MYRO - tommyrot
NELT - knelt
NIKE - moniker
OELA - shoelace
OFOL - twofold
OFTO - rooftop
ONIG - tonight
OOMM - roommate
OORK - doorknob
OMUC - insomuch
OWAD - nowadays
OWNO - brownout
OYEU - voyeur
PIOC - tapioca
PLEL - supplely
PONR - weaponry
RAOR - extraordinary
RESK - foreskin
ROOR - microorganism
RTHQ - earthquake
SAGN - lasagna
SPBE - raspberry
SPES - crispest
THAC - toothache
TYPU - platypus
UBBU - hubbub
UERK - sauerkraut
UGUG - plugugly
ZIPA - marzipan
A few more:
ACHACH - stomachache
TANTAN - instantaneous
Back to The Hipe Puzzle.