Vocabulary consisting only from characters you are able to read
効力
kourjoku
effect, efficacy, validity, potencymix
降下
kouka
fall, descent, (plane) landing, (atmos.) depressionsuru
山
jama
mountain, pile, heap, climax, critical pointjlpt5, shizen
年号
nengou
name of an era/year number/(P)leda1