| spur(noun, goad, incentive, impetus, promoter) |
| stimulant(noun, spur, goad, incentive, impetus) |
| sub(adjective, low, subject, secondary, indirect) |
| subaltern(adjective, low, inferior, subject, minor) |
| subalternate(adjective, lower, low, inferior, subject) |
| subject(adjective, low, inferior, minor, collateral) |
| submissive(adjective, low, inferior, subject, minor) |
| subnormal(adjective, lower, low, inferior, subject) |
| subsidary(adjective, subject, subordinate, collateral, additional) |
| substract(adjective, lower, low, inferior, subject) |
| supplement |
| supporting(adjective, support, spare, reserve, subordinate) |
| synchronal(adjective, joint, contemporary, collateral, attendant) |
| synchronous |
| synergetic |
| synergist(noun, spur, goad, incentive, impetus) |
| tailpiece |
| theriac |
| tributary(adjective, lower, low, inferior, subject) |
| tributory(adjective, reserve, minor, branch, helpful) |