OB
Obtain
Get, acquire, or secure (something).
Obligate
Bind or compel (someone), especially legally or morally.
Offend
Cause to feel upset, annoyed, or resentful.
Obliterate
Destroy utterly; wipe out.
Obtuse
Annoyingly slow to understand; dull-witted. (Of an angle) more than 90° and less than 180°.
Occur
Happen; take place.
Offer
present or proffer (something) for (someone) to accept or reject as so desired.
Obnoxious
extremely unpleasant.
Oblong
An object or flat figure in an elongated rectangle or oval shape.
Occupation
A job or profession.
Oppose
Disapprove of and attempt to prevent, especially by argument.
Occupy
Reside or have one's place of business in (a building).