- 積む【つむ】 - to pile up, to stack, to load (car, ship, etc.), to pack, to acquire, to accumulate 
- 積極的【せっきょくてき】 - positive, assertive, active, proactive, aggressive 
- 面積【めんせき】 - area (measurement), square measure, size (of land), floor space 
- 蓄積【ちくせき】 - accumulation, accumulate, store 
- 容積【ようせき】 - capacity, volume 
- 積雪【せきせつ】 - fallen snow, snow cover 
- 見積もり【みつもり】 - estimate, estimation, valuation, quotation 
- 山積【さんせき】 - piling up, accumulating, forming a (huge) pile, lying in piles 
- 体積【たいせき】 - capacity, volume 
- 堆積【たいせき】 - accumulation, pile, heap, sedimentation 
- 積もる【つもる】 - to pile up, to accumulate, to estimate 
- 山積み【やまづみ】 - huge mound, heap, pile 
- 積極【せっきょく】 - active, positive, progressive 
- 積ん読【つんどく】 - buying books and not reading them, stockpiling books, tsundoku, books bought but not read 
- 積み重ねる【つみかさねる】 - to pile up, to accumulate 
- 累積【るいせき】 - accumulation 
- 集積【しゅうせき】 - accumulation 
- 上積み【うわづみ】 - loading on top, piling on top, upper load, goods loaded on top, deck cargo, adding (to), increase (in quantity), additional amount 
- 積み重ね【つみかさね】 - pile, accumulation 
- 積立金【つみたてきん】 - reserve (fund), deposit