12-letter words containing a, b, o, v
- unobservable — incapable of observation; imperceptible
- unobservance — a failure to comply or observe (a law, custom, etc)
- unreprovable — not able to be reproved, reproached, or criticized
- unresolvable — not able to be resolved or brought to a satisfactory resolution
- unvoyageable — not able to be sailed or otherwise journeyed over; untraversable; innavigable
- valve bounce — A valve bounce is the bouncing of a poppet valve on its seat when it is closing.
- vedette boat — a small patrol vessel
- verbal irony — irony in which a person says or writes one thing and means another, or uses words to convey a meaning that is the opposite of the literal meaning.
- verbenaceous — belonging to the plant family Verbenaceae.
- vertebration — vertebrate formation.
- vocabularian — a person who is particularly or overly attentive to words
- vocabularied — having a vocabulary as specified
- vuelta abajo — a region in W Cuba.