まも.る 
() safeguard () protect
               
ごえい (n,vs) guard, convoy, escort
ごがん (n) river dike
ごけん (n) protecting the constitution
ごこく (n) defense of one's country, defence of one's country
ごそう (n,vs) escort (e.g. under guard), convoy

Links: KanjiDic: EDict : Wikimedia
Etymologies: 中文字譜 : 説文解字