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)

可能選択[kanousentaku] available choice
改選[kaisen] re-election
厳選[gensen] careful selection
互選[gosen] mutual election
公選[kousen] public election

再選[saisen] re-election
再選挙[saisenkyo] re-election
三選[sansen] third-term election
市長選[shichousen] mayoral election
自選[jisen] (author) selection