词根词缀：fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication

【来源及含义】Latin: to make, to do, to build, to cause, to produce; forming, shaping

【同源单词】Ab officio et beneficio, abortifacient, absorbefacient, absorbifacient, acoustoelectric effect, affair

词根词缀：-fy

【来源及含义】Latin: a suffix; make, do, build, cause, produce

【同源单词】acidify, aerify, albify, amplify, arborify, aurify

词根词缀：nul-, null-, nulli-

【来源及含义】Latin: not one, not any, none, nothing

【同源单词】Aliquis in omnibus, annul, annullable, annulment, Fortuna multis dat nimis, Fortuna obesse nulli contenta est semel