The Collaborative International Dictionary of English v.0.48:

Khan \Khan\, n. [Pers. & Tart. kh[=a]n.] [Also kan, kaun.]
   A king; a prince; a chief; a governor; -- so called among the
   Tartars, Turks, and Persians, and in countries now or
   formerly governed by them.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Khan \Khan\, n. [Per. kh[=a]n, kh[=a]nah, house, tent, inn.]
   An Eastern inn or caravansary. [Written also kawn.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cham \Cham\ (k[a^]m), n. [See Khan.]
   The sovereign prince of Tartary; -- now usually written
   khan. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

khan
    n 1: a title given to rulers or other important people in Asian
         countries
    2: an inn in some eastern countries with a large courtyard that
       provides accommodation for caravans [syn: caravansary,
       caravanserai, khan, caravan inn]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "khan":
   Dalai Lama, Esquire, Great Mogul, Holy Roman Emperor, Inca, Kaiser,
   Master, Mister, Mogul, Muslim rulers, Prinz, Sir, ardri, atheling,
   bey, cacique, caesar, caliph, cham, crown prince, czar, effendi,
   emir, hakim, heir apparent, heir presumptive, imam, kaid, king,
   knez, mikado, mirza, nawab, negus, nizam, padishah, pendragon,
   pharaoh, prince, prince consort, prince regent, princeling,
   princes of India, rig, sachem, sagamore, sahib, shah, shahzada,
   sheikh, sherif, shogun, sirdar, sire, sirrah, sultan, tenno,
   tycoon