>>212189542
Since other anons have already given you detailed explanations, I'll give you some other characters that have the same reading as 襲 (しゅう) in modern Japanese.

>囚
>収
>州
>周
>習
>終
>秋
>集
>臭
>就
>衆
>修
>週
>愁
>洲
>酬
>襲
>蹴
>and so on

Notice that you can form groups by bundling kanji together which share the same component.