SNAKESsssss
Oscar. "October Sky"
others
oats
obese
Snack
rhombus
endlessexpressexoticsembarks
swatch
tennisthistoss+plural of any word that starts with Ttactlesstackinessthalamustamenesstastelesstastinesstatterstearlesstenaciousthanklessthemselvesthermosthesisthesaurustidingstininessthinnessthoughtfulnessthoughtlessthoroughnessthrombosisthustightstigresstightnesstimelesstimelinesstinnitustogethernesstoiletriestonelesstongstoothlesstorturoustortuoustouchinesstraitoroustrashinesstreacheroustreasonoustreelesstremuloustrendinesstrellistremendoustrespasstrickinesstrimmingstritenesstruthfulnesstrichinosistrolleybustrustworthinesstuberculosistuberoustumultuoustunelesstweezerstyrannosaurustyrannous
soux
Nouns ending with -o that form the plural by adding -s to the end of the word are:autoscameoskangarooskilosmemosphotospianossolosstudiostattoosvideoszoos