航: Ⅰ名词(船) boat; shipⅡ动词(航行) navigate (by water or air); sail 短语和例子出航 set out on a voyage [flight]; 返航 return to base or port; 首航 maiden voyage or flight; 夜航 night navigation; 远航 long voyage
存: 动词1.(存在; 生存) exist; live; survive 短语和例子残存 remnant; surviving; 名存实亡 exist only in name but not in reality2.(储存; 保存) store; keep 短语和例子存粮 store up grain; 封存 seal up for safekeeping; 水库存了大量的水。