4-Letter Words That End With: O

• A male servant, especially an attendant to a bullfighter.

• A title of respect for a young man (usually unmarried) with or without a name used.

• An unmarried man, a boy.

• of or relating to the null set (a set with no members)

• a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

• a mathematical element that when added to another number yields the same number

• the point on a scale from which positive or negative numerical quantities can be measured

• the sight setting that will cause a projectile to hit the center of the target with no wind blowing

• indicating the absence of any or all units under consideration

• having no measurable or otherwise determinable value

• indicating an initial point or origin

• adjust (an instrument or device) to zero value

• adjust (as by firing under test conditions) the zero of (a gun)

• a magic power or magic spell

• a collection of things (goods or works of art etc.) for public display

• a Greek liquor flavored with anise

• pasta shaped like pearls of barley; frequently prepared with lamb in Greek cuisine

• a sport adapted from jujitsu (using principles of not resisting) and similar to wrestling; developed in Japan

• The ring, made of compacted clay, in which a sumo wrestling match is held.

• A training facility, usually led by one or more sensei; a hall or room used for such training.

• (by extension) A room or other facility used for other activities, such as meditation or software development.

• The dojo loach, Japanese weather loach, or pond loach (Misgurnus anguillicaudatus), a freshwater fish native to East Asia.