Snowball :  (noun)
1: plant having heads of fragrant white trumpet-shaped flowers; grows in sandy arid regions [syn: sweet sand verbena, Abronia elliptica]
2: ball of ice cream covered with coconut and usually chocolate sauce
3: ball of crushed ice with fruit syrup
4: snow pressed into a ball for throwing (playfully)
Snowball : (verb)
1: increase or accumulate at a rapidly accelerating rate
2: throw snowballs at ... ( more )

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accrue, accumulate, accumulation, acervation, advance, agglomerate, agglomeration, aggregate, aggregation, amassment, appreciate, augment, avalanche, ball, balloon, bead, blizzard, bloat, boom, breed, broaden, build, bulk, chunk, congeries, conglobation, conglobulate, conglomerate, conglomeration, crescendo, crystal, cumulation, develop, dilate, distend, driven snow, enlarge, expand, extend, fill out, flake, flurry, gain, gain strength, gathering, get ahead, globe, glomeration, go up, gob, granular snow, greaten, grow, hunk, igloo, increase, intensify, lump, mantle of snow, mass, mogul, mount, multiply, mushroom, proliferate, puff up, rise, run up, shoot up, slosh, slush, snow, snow banner, snow bed, snow blanket, snow blast, snow fence, snow flurry, snow roller, snow slush, snow squall, snow wreath, snow-crystal, snowbank, snowbridge, snowcap, snowdrift, snowfall, snowfield, snowflake, snowland, snowman, snowscape, snowshed, snowslide, snowslip, snowstorm, sphere, spherify, spread, stockpile, strengthen, stretch, swell, tumefy, upsurge, wad, wax, wet snow, widen,