Day of reckoning and Last day

Day of reckoning noun - (New Testament) day at the end of time following Armageddon when God will decree the fates of all individual humans according to the good and evil of their earthly lives.

Last day and day of reckoning are semantically related in judgment day topic. In some cases you can use "Last day" instead a noun phrase "Day of reckoning", when it comes to topics like day of judgment, day of judgement.

Last day noun - (New Testament) day at the end of time following Armageddon when God will decree the fates of all individual humans according to the good and evil of their earthly lives.

Day of reckoning and last day are semantically related in judgment day topic. You can use "Day of reckoning" instead a noun phrase "Last day", if it concerns topics such as day of judgment, day of judgement.