synonym sophisticated syndrome soothe syncope symposium symphony solute somatic symptom solvent solution sympathy soluble sympathize solitude sympathetic solitary symmetry solidify symmetrical solidarity symbolic solicit symbol solemn syllabus sole sword socket sodium switch swing sociology swift swell sociologist sober swerve sociological swear sob sway soar swarm soap swamp soak swab suture sustainable snob sustain sniff snuff snore suspicious sneeze suspicion sneer suspend snatch suspect snap susceptible snail survey snag surveillance snack surrender smuggle surprise surplus smother smear surpass smash smallpox suppuration supreme sly suppress slumber supposition slum supine sluggish supervision slough slot supervene slope superstition slogan supersonic slit slippery superfluous supervise superior slip slipper superficial superb slim sunburnt summon slide sumptuous slender slice summit sleeve summary slap slaughter summarize sulphur slang sulphate slander sulfa slack suite skull suffocate suicide skid sketch suffice skeleton sue situate suck site succumb sip sinus suburban suburb subtract sincere sin singularity substrate subtle simplicity substitution silicosis substitute silicon subsidy signature subside sigmoid subsequent sigh subsidiary signage subscription sift subscribe sieve subordinate sickle submit shuttle submerge shunt submarine shrug subjunctive shrinkage shudder sublethal subjective shrink shrimp subdivide shrill subdue subconscious shrewd subcutaneous shriek sturdy shower stupor stun shiver shovel stumble shipwreck stuff studio shilling shift stud stubborn shelter shield strut shell stroll sheer stroke shed strive sheath stripe shear strip shave string shareholder stride shameful stretch shampoo stricture streptomycin shady shame strenuous sewage streak shabby streamline severe stray strawberry sever serum session strategic straw sesame strategy serpent strap serial serology strain sequence stout sequel stove storey septic storage separator stoop sentiment stool sensory stocking sensitize stock sensitivity stitch sensation stipulate senior sting sensational stir stimulus senile senescent stimulation senesce stimulate senate seminar stimulant stifle semiconductor stiffness stiff selfish seize steward semester stick segregation stethoscope segment seep sterilization sediment sterilize sedentary sedative sterile security stereotype section stereo secretive sternum steroid steppe secrete secretary stem secrecy steep seal steer seagull status scurvy stature scrutinize statue steamer scrupulous statistics scrub script static statistical stationery screen screwdriver stationary screw starve starvation startle starch scratch scrape scramble scout stammer stall scorch stale scorn stake staircase sclerosis schizophrenia schistosomiasis stainless scent stagnant scenery stagger scene scavenge stadium scarlet scatter stack stable scarf stain stab scare squirrel scarce squint scar squeeze scanty scan squad scalpel sputum scalp spurt scale sprout scab scabies sprinkle spray saw sprawl savage sprain sausage sauce spot spouse saturation spore saucer saturate spotted spoor satire spoon satellite spontaneous satchel sponsor sardine spongy sarcasm sponge sanitary spoil sanitarian split sane splay sanatorium spleen salve salvage splash salute spite spit salutary salubrious splint spiritual saline spire sake spiral spindle saddle spinal sadden spin spill sacred sacrifice spider sack spice sphygmomanometer sabotage Saint spherical sphincter sphere speculation sperm speculate spectacular spectacle spectrum spectator SAC speck specimen specify specification specific species specialty specialize spear spasm sparkle sparse sparrow spark span spade spacious soybean sow syrup systole Soviet souvenir syringe sour synthetic soporific syphilis sore synthesis sophomore