Following are all the runnel like words, in the list below.
RIVULET
100% like runnel
STREAMLET
100% like runnel
RILL
100% like runnel
RUN
99.62% like runnel
RILLET
66.71% like runnel
BROOK
66.1% like runnel
PLASHING
33.43% like runnel
GULLY
33.43% like runnel
PLASHED
33.43% like runnel
SWITCHBACKING
33.43% like runnel
GULLEY
33.43% like runnel
CRANNIED
33.43% like runnel
PLASHY
33.43% like runnel
LAKELET
33.43% like runnel
SLUICEWAY
33.43% like runnel
SIPHONAL
33.43% like runnel
RIDGE
33.43% like runnel
DOLINE
33.43% like runnel
BOULDERY
33.43% like runnel
CINDERY
33.43% like runnel
SLUICE
33.43% like runnel
SHINGLY
33.43% like runnel
CLUMB
33.43% like runnel
HUMMOCK
33.43% like runnel
STREAMLETS
33.43% like runnel
SPARRY
33.43% like runnel
SLUICED
33.43% like runnel
CROST
33.43% like runnel
PLASH
33.43% like runnel
SLABBY
33.43% like runnel
WATERWORN
33.43% like runnel
LILIED
33.43% like runnel
EMBANKING
33.43% like runnel
LANDWARDS
33.43% like runnel
DUGWAY
33.43% like runnel
CRAWLWAY
33.43% like runnel
CRAGGED
33.43% like runnel
FELLSIDE
33.43% like runnel
ROCKPILE
33.43% like runnel
CASTELLATION
33.43% like runnel
GULLEYS
33.43% like runnel
GROUNDWARD
33.43% like runnel
BATTLEMENTED
33.43% like runnel
GRAVEL
33.43% like runnel
BROOKLET
33.43% like runnel
WALER
33.43% like runnel
SCENDING
33.43% like runnel
BOREEN
33.43% like runnel
GULLYING
33.43% like runnel
BRANCHLET
33.43% like runnel
BALUSTRADED
33.43% like runnel
RILLS
33.43% like runnel
LANTHORN
33.43% like runnel
HUMMOCKS
33.43% like runnel
STREETE
33.43% like runnel
RIMY
33.43% like runnel
METALLING
33.43% like runnel
BRAE
33.43% like runnel
RIMING
33.43% like runnel
LEDGY
33.43% like runnel
ROADCUT
33.43% like runnel
ADOWN
33.43% like runnel
VALLUM
33.43% like runnel
SCANDENT
33.43% like runnel
ASTREAM
33.43% like runnel
FOUNTAINING
33.43% like runnel
WALKWAY
33.43% like runnel
EDDIED
33.43% like runnel
RILLING
33.43% like runnel
DRAGGLED
33.43% like runnel
SCUTTERING
33.43% like runnel
GULLIES
33.43% like runnel
WATERCOURSE
33.43% like runnel
SNOWFIELD
33.43% like runnel
SINUATE
33.43% like runnel
SLUICEWAYS
33.43% like runnel
ROCKFACE
33.43% like runnel
VERTICILLATE
33.43% like runnel
VERGLAS
33.43% like runnel
DESCENDING
33.43% like runnel
PIPESTEM
33.43% like runnel
HEADFOREMOST
33.43% like runnel
GUNNEL
33.43% like runnel
PALISADING
33.43% like runnel
GRAVELLING
33.43% like runnel
FORESIDE
33.43% like runnel
MILLRACE
33.43% like runnel
CUSPATE
33.43% like runnel
CLOUGH
33.43% like runnel
TREMIE
33.43% like runnel
RUNLET
33.43% like runnel
PRILL
33.43% like runnel
RIPPLET
33.43% like runnel
RIFFLE
33.43% like runnel
TRICKLE
33.43% like runnel
STREAMLING
33.43% like runnel
RITHE
33.43% like runnel
DRILL
33.43% like runnel
RUSH
33.43% like runnel
RAYLET
33.43% like runnel