Coding and Decoding Questions

In a certain code language, "DONKEY" is written as "YEKNOD". Howis "RAINBOW" written in that code language?

In a certain code language, "ACCOUNT" is written as "DFFRXQW". How is "MATHS" written in that code language?

In a certain code language, "TRAIN" is written as "NIART". How is "SCOOTER" written in that code language?

In a certain code language, “POWER” is written as “RMYCT”. How is “TABLE” written in that code language?

In a certain language "BROTHER" is written as "CSPUIFS". How is "SISTER" written in that code language?

In a certain code language, "FAILURE" is written as "FRULIAG". How is "SUCCESS" written in that code language?

In a certain code language, "MOTHER" is written as "NPUGDQ". How is "ORANGE" written in that code language ?

In a certain code language, "CUTE" is written as "9251" and "REST" is written as "4135". How is "RESCUE" written in that code language?