自卫 

Pinyin: zì wèi 
Meaning：Self-defense
Sentence: 在打斗中为了自卫把人打死是一回事，残酷无情地开枪杀人是另一回事。 
It's one thing to kill a man in a fight, in self-defence, another to shoot him in cold blood.

More: 

自：

Pinyin: zì
Meaning: Oneself; since; self; from
Radical: 自
Stokes: 6
Traditional: 自
Common words/Phrase:
自己zì jǐ 【own; self】
自动zì dòng 【automatic】
自选zì xuǎn 【optional】
自由zì yóu 【freedom; liberty】

卫：

Pinyin: wèi
Meaning: To guard; to protect
Radical: 卩
Stokes: 3
Traditional: 衛
Common words/Phrase:
卫星 [wèi xīng] 【satellite】 
保卫 [bǎo wèi] 【safeguard】
侍卫 [shì wèi] 【housecarl】
前卫 [qián wèi] 【avant-garde】
中央 [zhōng yāng] 【central; center】