一粒[hitotsubu] (a) grain
一粒子既約[ichiryuushikiyaku] one particle irreducible (physics)
一粒種[hitotsubudane] an only child
雨粒[amatsubu] raindrop
穀粒[kokuryuu] kernel

素粒子[soryuushi] elementary particle
素粒子加速器[soryuushikasokuki] particle accelerator
大粒[ootsubu] large grain
長粒米[chouryuumai] long grain rice
麦粒腫[bakuryuushu] sty (on the eyelid)

霰弾[sandan] shot
霰弾銃[sandanjuu] shotgun
雨霰[amearare] hail (e.g. of bullets)
霰粒腫[sanryuushu] chalazion (sebaceous cyst of the eyelid)
霰餅[araremochi] roasted mochi pieces (usu. flavoured with soy sauce, or sweetened with sugar, etc.)

霰石[arareishi] aragonite
雪霰[yukiarare] soft hail
氷霰[kooriarare] small hail
雛霰[hinaarare] sweetened rice-flour cakes for offering at the Dolls' Festival