| SABBATH | | SABER |
| SABER-TOOTH | | SABLE |
| SADIE | | SAFARI |
| SAFFRON | | SAGA |
| SAGE | | SAHARA |
| SAILOR | | SAKE |
| SALAMANDER (MANDY) | | SALSA |
| SALTY | | SALVATORE |
| SAM | | SAM-I-AM |
| SAMBUCA | | SAMMY |
| SAMSON | | SAMURAI |
| SAND RAT | | SANDMAN |
| SANGRIA | | SANTA FE |
| SANTINI | | SANTO |
| SAPPHIRE | | SARASOTA |
| SARGE | | SASHA |
| SASHIMI | | SASQUATCH |
| SASSAFRAS | | SASSY |
| SATAY | | SATCHMO |
| SATIN | | SAUCE or SAUCY |
| SAUSAGE | | SAVAGE |
| SAVANNAH | | SAVERNAKE |
| SAVOY | | SCAMPER |
| SCAMPI | | SCARBOROUGH |
| SCARLET | | SCHATZE |
| SCHMOO | | SCHMOOZE |
| SCHNAPPS | | SCHNOOK |
| SCHOONER | | SCHWARZKOPF |
| SCHWEPPES | | SCINTILLA |
| SCOOBIE | | SCOOTER |
| SCORPIO | | SCOTCH |
| SCOUNDREL | | SCOUT |
| SCRAPPY | | SCRAPPY TOO |
| SCROOGE | | SCRUFFY |
| SCRUMPTIOUS | | SCUBA |
| SCUD | | SCYLLA |
| SEA DOG | | SEABREEZE |
| SEAL | | SENECA |
| SERA | | SERENADE |
| SERENDIPITY | | SERENGETI |
| SERGEANT | | SEUSS |
| SEYCHELLES | | SEYMOUR |
| SHADOW | | SHAH |
| SHAKESPEARE | | SHALIMAR |
| SHAMROCK | | SHAMU |
| SHANE | | SHANGRI-LA |
| SHARKEY | | SHARP |
| SHAWNEE | | SHE-DEVIL |
| SHEBA | | SHEER |
| SHEIK | | SHELLEY |
| SHENANIGANS | | SHERIFF |
| SHERLOCK | | SHERWOOD |
| SHIITAKE | | SHIKSA |
| SHIM SHIM SHIREE | | SHIVA |
| SHOELESS | | SHOGUN |
| SHOOTER | | SHORTY, SHORTCAKE or SHORTSTACK |
| SHOTGUN | | SHOWBOAT |
| SHOWOFF | | SHRAMSBERG |
| SHRAPNEL | | SHREDDER |
| SHRIMP | | SHYLOCK |
| SICILIANO | | SIDEWAYS |
| SIDNEY | | SIEGFRIED |
| SIENNA | | SIERRA |
| SIGMUND | | SILHOUETTE |
| SILKY | | SILVER |
| SILVERSPOON | | SIMPLY RED |
| SIN | | SINATRA |
| SINBAD | | SINCLAIR |
| SINGER | | SISSY |
| SITTING BULL | | SIX TOES |
| SKEDADDLE | | SKEEDER |
| SKIDDER | | SKIPPER |
| SKIPPY | | SKITTLES |
| SKY | | SKY HAWK |
| SKYROCKET | | SKYWALKER |
| SLATE | | SLEESTACK |
| SLICKER | | SLIPPERS |
| SLOBBER-PUSS | | SLOTH |
| SLUGGER | | SLY |
| SMASHER | | SMOKEY |
| SMOOCHER | | SMORES |
| SNAGGLETOOTH | | SNAKER |
| SNAP | | SNARL |
| SNEAKERS | | SNEEZY |
| SNICKERS | | SNIFFER |
| SNIFFLES | | SNIFTER |
| SNO-PEA | | SNOCAP |
| SNOOGYBEAR | | SNOOKER |
| SNOOKS | | SNOOKUMS |
| SNOOPER | | SNOOPY |
| SNOOTY | | SNORTER |
| SNOW, SNOWBALL or SNOWFLAKE | | SNOWBERRY |
| SNOWBUNNY | | SNOWMAN |
| SNUFFLES | | SNUGGLES or SNUGGLE-PUSS |
| SOCKS | | SOCRATES |
| SOLEIL | | SOLO |
| SOLOMON | | SOLSTICE |
| SONATA | | SOONER |
| SOPHIE | | SORBET |
| SORCERER or SORCERESS | | SOUEEE |
| SOURDOUGH | | SOUTHERN COMFORT |
| SOUTHPAW | | SPADES |
| SPAGHETTI | | SPAGO |
| SPAM | | SPANKY |
| SPARKEY or SPARKLE | | SPARKPLUG |
| SPARROW | | SPECS |
| SPEEDY | | SPELLBINDER |
| SPHINX | | SPICY |
| SPIDER | | SPIKE |
| SPINNER | | SPIRIT |
| SPITFIRE | | SPLASH |
| SPOCK | | SPOOKY |
| SPORT | | SPOT |
| SPRITE | | SPUDS |
| SPUMANTI | | SPUNKY |
| SPUTNIK | | SPY |
| SPYRO | | SQUAT |
| SQUEAKY | | SQUID |
| SQUIRT | | STAR |
| STARDUST or STARLIGHT | | STARGAZER |
| STARLET | | STELLA |
| STELLAR | | STERLING |
| STETSON | | STING |
| STINKER or STINKER BELLE | | STINKY |
| STOLI | | STONEY |
| STORM or STORMY | | STOWAWAY |
| STRAY | | STREGA |
| STRUDEL | | STUBBY or STUBBLES |
| STUMP | | SUGAR |
| SUGAR-PLUM | | SUGARBABY |
| SUGARBAKER | | SUKIYAKI |
| SULFUR | | SULTAN |
| SUMO | | SUNDANCE |
| SUNDOWN | | SUNI |
| SUNKISS | | SUNNYBROOK |
| SUNRISE | | SUNSHINE |
| SUPERTRAMP | | SUSHI |
| SUSSUDIO | | SWAMI |
| SWAMPY | | SWEATHOG |
| SWEET CHEEKS | | SWEET PEA |
| SWEETHEART, SWEETIE or SWEETNESS | | SWIZZLE |
| SYMPHONY | | SYNERGY |
