The Collaborative International Dictionary of English v.0.48:

Stupa \Stu"pa\ (st[=oo]"p[.a]), n. [Skr. st[=u]pa.]
   A mound or monument commemorative of Buddha.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Stupa \Stu"pa\ (st[=u]"p[.a]), n. [L.] (Med.)
   See 1st Stupe.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stupa
    n 1: a dome-shaped shrine erected by Buddhists [syn: stupa,
         tope]

Moby Thesaurus II by Grady Ward, 1.0:

123 Moby Thesaurus words for "stupa":
   antenna tower, arch, barbican, barrow, beehive tomb, belfry,
   bell tower, bone house, boundary stone, box grave, brass, burial,
   burial chamber, burial mound, bust, cairn, campanile, catacombs,
   cenotaph, charnel house, cist, cist grave, colossus, column,
   cromlech, cross, crypt, cup, cupola, cyclolith, dagoba, deep six,
   delubrum, derrick, dokhma, dolmen, dome, fire tower, footstone,
   grave, gravestone, headstone, hoarstone, holy place,
   house of death, inscription, lantern, last home, lighthouse,
   long home, low green tent, low house, marker, martello,
   martello tower, mast, mastaba, mausoleum, megalith, memento,
   memorial, memorial arch, memorial column, memorial statue,
   memorial stone, menhir, minaret, monolith, monstrance, monument,
   mound, mummy chamber, naos, narrow house, necrology, obelisk,
   obituary, observation tower, ossuarium, ossuary, pagoda,
   passage grave, pilaster, pillar, pinnacle, pit, plaque, pole,
   prize, pylon, pyramid, reliquaire, reliquary, remembrance,
   resting place, ribbon, rostral column, sacrarium, sepulcher, shaft,
   shaft grave, shrine, skyscraper, spire, standpipe, steeple, stela,
   stone, tablet, television mast, testimonial, tomb, tombstone, tope,
   tour, tower, tower of silence, trophy, tumulus, turret, vault,
   water tower, windmill tower