- 質問【しつもん】 - question, inquiry, enquiry 
- 人質【ひとじち】 - hostage 
- 物質【ぶっしつ】 - material, substance, matter 
- 本質【ほんしつ】 - essence, true nature, substance, reality 
- 素質【そしつ】 - makings (of), aptitude, talent, qualities, nature, character, temperament 
- 体質【たいしつ】 - constitution (physical), physical make-up, predisposition (to disease), disposition, tendency, character (of a group, organization, etc.), innate characteristics, make-up, nature, culture 
- 品質【ひんしつ】 - quality (of a product or a service) 
- 悪質【あくしつ】 - malicious, vicious, malignant, underhanded, shoddy, inferior, poor-quality, second-rate 
- 性質【せいしつ】 - nature, property, disposition 
- 気質【きしつ】 - disposition, temperament, nature, mentality, spirit, character, trait, turn of mind 
- 地質【ちしつ】 - geological features 
- 質量【しつりょう】 - mass 
- 特質【とくしつ】 - characteristic, feature, special quality 
- 質屋【しちや】 - pawnshop 
- 質素【しっそ】 - simple, plain, modest, frugal, reserved 
- 実質【じっしつ】 - substance, essence, substantive, substantial, essential, real (e.g. interest rate), in essence, in effect, essentially, effectively, practically, parenchyma 
- 実質的【じっしつてき】 - substantial, real (as opposed to nominal) 
- 質疑【しつぎ】 - question, interpellation 
- 水質【すいしつ】 - water quality 
- 異質【いしつ】 - different (quality, nature), heterogeneous