词根词缀：gon-, gonio-, -gon, -gonal, -gonally, -gony

【来源及含义】Greek: corner, bend, angle

【同源单词】agonic, decagon, diagon, diagonal, dodecagon, enneagon

词根词缀：nona-, noni-, non-

【来源及含义】Latin: nine

【同源单词】Nona, nonagenarian, nonagenarianism, nonagesimal, nonagon, nonan