I can’t seem to figure out the optimum presentation of answers here, so I’ll do it two ways!
1.d. 大役 (taiyaku: important task or role or duty) big + role
2.d. 対訳 (taiyaku: original text with its translation printed side by side or on opposite page) facing each other + to translate
3.a. 背約 (haiyaku: breach of promise) back + promise
4.c. 改訳 (kaiyaku: retranslation, revision) to revise + translation
5.b. 災厄 (saiyaku: disaster) disaster + disaster
6.d. 大厄 (taiyaku: calamity, disaster) big + disaster
7.c. 解約 (kaiyaku: cancellation of a contract) to cancel + contract
8.a. 配役 (haiyaku: cast (of a play)) to allocate + role
__________________________________________________________
a. haiyaku
3. 背約 (breach of promise) back + promise
8. 配役 (cast (of a play)) to allocate + role
b. saiyaku
5. 災厄 (disaster) disaster + disaster
c. kaiyaku
4. 改訳 (retranslation, revision) to revise + translation
7. 解約 (cancellation of a contract) to cancel + contract
d. taiyaku
1. 大役 (important task or role or duty) big + role
2. 対訳 (original text with its translation printed side by side or on opposite page) facing each other + to translate
6. 大厄 (calamity, disaster) big + disaster
