APT/EPT apt aptness adapt adaptable adaptive inapt inaptitude adaptation aptitude adept inept
ART artist artistic artless artificial artful artifact artifice artisan
CAD/
CID/
CAS cadence decadence accident accidental deciduous incidence incident incidental coincide coincidence coincident Occident cascade case casual occasion occasional cadaver casualty decadent recidivism
CIS concision decide decision decisive excision fratricide incise incision insecticide matricide patricide precise suicide concise excise incisive precision
RAD/
RAS abrade abrasion abrasive erase erasable eraser erasure raze razor
RADI radical radicalism radicalize radicalization radicand radish radix eradicate eradicable eradication eradicator
RADI radium radius radial radiate radiation radiator radiant radio radioactive radioactivity radiology radiotelephone radiotherapy irradiate irradiation irradiant irradiance
RAP/
RAV rape rapist rapacious rapacity rapid rapidity rapt rapture enrapt enrapture rapturous raptorial ravage raven ravening ravish ravishment
RAT/
RATIO ratify ratio ratiocinate ratiocination ration rational rationale rationalism rationalist rationality rationalize rationalization irrational irrationality
REG regal regalia regality regent regency regicide regime regiment Regina regius region realm regnant reign regular regularity regulate regulation irregular royal royalty rigid rigidity rigor rigorous
REPT reptile reptilian surreptitious
RID/
RIS ridicule ridiculous risible risibility deride derision derisive derisory
ROD/
ROS rodent corrode corrosion corrosive erode erosion erosive
ROT rotary rotate rotation rotational rotator rotor rotund rotunda rotundity dextrorotatory levorotatory
RUD rude rudiment rudimental rudimentary erudite erudition
RUPT rupture abrupt abruption bankrupt bankruptcy corrupt corruption disrupt disruption erupt eruption incorrupt incorruptible interrupt interruption irrupt irruption route routine
RUR/
RUS rural rustic rusticate rustication rusticity
SAL salad salary salaried saline salinity salt salted desalt desalination
SAL/
SUL salient salience sally salmon assail assault desultory exult exultation insult resilient resilience result
SAL/SAN salute salutatory salutation salubrious salutary sane sanity insane insanity sanative sanatorium sanitary sanitation sanitarian
SANGUI sanguine sanguinary sanguineous sanguinity consanguine consanguinity ensanguine
SAT sate satiate satiation satiable satiety insatiable insatiability insatiate satire satisfy satisfaction satisfactory dissatisfy dissatisfaction dissatisfactory saturation soil
SECT sectarian sectary section sectional sectionalism sectionalize bisect bisection dissect dissection dissector insect insecticide insectivorous intersect intersection vivisection secant segment
SED/SESS/SID sedate sedative sedentary sediment sedimentation sedulous sessile session assess assessor assiduity dissidence dissident insidious obsess obsessive possess possessed possession dispossess prepossess repossess preside president presidency presidium reside residence resident residential residual residue subside subsidence subsidize subsidy subsidiary supersede siege besiege consult consultant consultation exile
SEMIN disseminate seminal seminar seminary dissemination inseminate insemination
SEN senate senator senatorial senescent senescence senile senility senior seniority
SERT series serial seriate serried assert assertion assertive concert desert deserted desertion dissertation exert exertion insert insertion reassert reassertion
SINU sinuate sinuous sinuosity sinus sinusitis insinuate insinuation insinuative
SIST/STIUT/STA/ST assist assistance assistant consist consistent consistence exist existent existence insist insistent insistence persist persistent persistence resist resistant resistance irresistible subsist subsistence constitute constituent constitution constitutional destitute destitution institute institution prostitute restitute restitution solstice substitute substitution superstition superstitious stable stabilize stabilization stability establish establishment stage contrast obstacle obstetric obstinate obstinacy stance state stately statement static station stationary stationer stationery statistics statue stature status statute estate stead steady steadfast circumstance circumstantial circumstantiate constant constancy destine destiny destination distant distance extant instant instance instantaneous substance substantial substantiate restore restoration stall install installation installment apostasy apostate ecstasy ecstatic metastasis system
SOCI sociable sociability social socialism socialist socialite socialize socialization society sociology sociologist associate associable associated association associative consociate consociation dissociate dissociable dissociation
SOL sole solely solitary solitude solo soloist solemn solemnity soliloquy solid solidity solidify consolidate console consolation solace desolate desolation solar solarium circumsolar insolate parasol turnsole
SOM somnambulate somnambulism somnambulist somniferous somnolent somnolence insomnia insomniac
SORT sorter assort assorted assortment consort consortium resort
SPER desperado desperate desperately desperation despair despairing prosper prosperity prosperous
SPERS asperse aspersion disperse dispersal dispersed dispersion dispersive intersperse interspersion sparse
SPIR spirit dispirit inspirit spiritual spiracle sprightly aspire aspirant aspiration conspire conspirator expire expiration expiry inspire inspiration perspire perspiration respire respiration respiratory suspire transpire
SPLEND splendid splendiferous splendor resplendent resplendence
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