SNAKESsssss
Oscar. "October Sky"
oats
others
obese
endlessexpressexoticsembarks
rhombus
Snack
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