質朴[shitsuboku] simplicity
素朴[soboku] simplicity
惇朴[tonboku] honest and homely
朴の木[hoonoki] magnolia (Magnolia obovata)
朴直[bokuchoku] simplicity

朴念仁[bokunenjin] quiet unsociable person
朴とつ[bokutotsu] unsophisticated
醇朴[junboku] rustic simplicity
単純素朴[tanjunsoboku] plain and simple