solvent
the liquid in which a solute is dissolved to form a solution
unencumbered
not having any burden or impediment
creosote
a dark brown oil distilled from coal tar and used as a wood preservative
bombardier
a member of a bomber crew in the US Air Force responsible for sighting and releasing bombs
modulation
the exertion of a modifying or controlling influence on something
incendiary
a person who excites factions, quarrels, or sedition