| substitutive(reserve, subsidiary, supportive) |
| subsumed(adverb, low, inferior, amenable, secondary) |
| supplementary(adjective, low, subject, minor, collateral) |
| supportive(adjective, reserve, collateral, subsidiary, subservient) |
| susceptible(adjective, sensitive, apt, secondary) |
| synchronal(adjective, subject, collateral, subsidiary, subservient) |
| take the place of(verb, expression, idiom, substitute, replace) |
| tentative(adjective, sensitive, apt, secondary) |
| tied to apron strings(expression, idiom, collateral, subalternate, low-set) |
| to the bottom(expression, adjective, idiom, adverb, lower) |
| tributory(adjective, reserve, collateral, subsidiary, subservient) |
| trivial(adjective, inferior, insignificant, unimportant, minor) |
| two bit(expression, adjective, lower, subject, collateral) |
| under thumb(expression, collateral, subalternate, low-set) |
| underneath(adverb, under) |
| understudy(verb, substitute, replace, re-present, deputize) |
| unelevated(collateral, subalternate, low-set) |
| unimportant(adjective, inferior, insignificant, minor, subordinate) |
| unreasoning(adjective, collateral, subsidiary, subservient, subalternate) |
| unsustaining(collateral, subalternate, low-set) |