Sublimate
Part of speech: verb
Definition: To change state from a solid to a gas (or from a gas to a solid) without passing through the liquid state (transitive or intransitive) To purify or refine a substance through such a change of state. To modify the natural expression of a sexual or primitive instinct in a socially acceptable manner; to divert the energy of such an instinct into some acceptable activity. To raise to a place of honor.
Rarefy
Part of speech: verb
Definition: To make rare, thin, porous, or less denseTo expand or enlarge without adding any new portion of matter to.