The term 'post-mortal' is relatively uncommon and has limited synonyms. However, there are several alternative phrases that can be used to convey a similar meaning. For instance, 'posthumous' refers to something that occurs or is awarded after a person's death. 'Afterlife' is another phrase that describes the state of existence after death. 'Post-death' and 'post-passing' both refer to the time period after someone has died. Additionally, the term 'late' can be used to describe someone who has passed away, while 'deceased' is a more formal way of referring to someone who has died. Overall, while there are not many direct synonyms for 'post-mortal', there are several alternative phrases that convey a similar meaning.