profusion：大量，丰富，充沛

词根词缀：pro-前 + -fus-熔,注 + -ion名词词尾

• stroppy
• structural
• structuralism
• structure
• strudel
• struggle
• strut
• strychnine
• stub
• stubble
• stubborn
• stubby
• stucco
• stuck
• stud
• studded
• studio
• studious
• studmuffin
• study
• studying
• stuff
• stuffing
• stuffy
• stultify