10 letters
- retrovirus15
- rhinovirus18
- ridiculous17
- robustious15
- roisterous11
- salubrious16
- saxicolous22
- scandalous17
- scarabaeus17
- scrofulous19
- scrupulous20
- scurrilous16
- sequacious24
- serotinous12
- sinistrous12
- slanderous14
- slumberous19
- solicitous15
- spirituous15
- splendrous17
- stertorous11
- strabismus17
- stridulous14
- struthious14
- stupendous17
- subaqueous25
- sulphurous19
- suspicious18
- syncarpous20
- synonymous20
- tendrilous14
- tenebrious15
- testaceous14
- theonomous17
- thunderous16
- traitorous11
- treasonous12
- tremendous16
- trichinous17
- trolleybus18
- trousseaus12
- tuffaceous21
- tumultuous18
- ubiquitous25
- umbrageous20
- ungenerous16
- ungracious18
- unhumorous19
- uproarious15
- vaginismus21
- victorious18
- villainous18
- violaceous19
- viraginous18
- viviparous22
- vociferous21
- voluminous21
- voluptuous21
- zoophilous26