- sediment: residue, remains
- seek: search for, look for/ try, endeavor
- seize: take
- selected: peculiar, chose, SPECIAL DELIVERY
- self-sufficient: independent
- seminal: influential, viable
- sequence: series , succession, progression
- set in motion: start, initiate
- settle down: become orderly
- sever: cut off, separate, cleave
- share: portion
- sheltered: protected
- shift: change, move
- shortcoming: disadvantage, difficulty, defect, drawback
- shortly: soon
- shred: tear apart
- shrink: contract, become smaller, tighten
- signal: indicate
- significant: important, substantial, remarkable, serious
- simultaneously: at the same time
- sites: places, locations
- sizable: large, great
- slender: thin
- slight: minor
- smell: scent, odor, fragrance, aroma
- snatch: grasp, seize
- sole: only, solitary, lone
- solidify: strengthen, harden,
- sophisticated: complex / highly developed
- sort: type, kind
- spanduration: period
- spawn: lay eggs/ generate
- speck: particle, dot
- spectrum: range, scope
- speculate: suppose, hypothesize / gamble
- speculative: unproven
- split: divide
- sporadic: infrequent, occasional, intermittent, irregular
- spring up: suddenly arise
- spur: stimulate
- stage: hold
- staggering: overwhelming, astonishing
- stamina: endurance, vigor, energy
- stand for: symbolize, represent
- standstill: complete stop
- staple: basic item, basic food
- startle: surprise
- stationary: not moving, fixed, immobile
- stem from: grow out of, arise from, derive from, originate from
- stick to: cling to, adhere to