ferment

torment

foment

surmise

premise

demise

surfeit

forfeit

counterfeit

supple

topple

stipple

ripple

supine

spine

opine

 pine

tamp

temp

thorn

 horn

thatch

 hatch

terse

verse

testament

testimony

tepid

torpid

tare

tear

tatty

tasty

swell

swill

slander

slender

suture

future

swindle

dwindle

swerve

serve

sway

away

susceptible

suspect

surcharge

discharge

tout

pout

tonic

toxic

surmount

paramount

surplus

nonplus

tiff

miff

asunder

 sunder

timber

timbre

superb

supreme

supplement

suppliant

suffuse

profuse

defuse

infuse

superficial

beneficial artificial

stroke

stoke

stove

feign

deign

reign

budge

budget

fidget

strut

stunt

extinguish

distinguish

extrovert

controvert

sullen

pollen

feint

faint

fell

pell-mell

felon

melon

fiat

riot

stunning

cunning

levelheaded

hardheaded

fissure

tissue

 issue

flagrant

fragrant

flak

flake

fluke

flare

glare

flaw

claw

fledge

pledge

flirt

flit

flout/pout

clout

clot

cloy

frantic

frenetic

fresco

fiasco

fringe

cringe

resurgence

insurgence

shard

 hard

sheriff

tariff