Common words:
* Postpone: to delay something to a later time
* Postscript: a note added after the end of a letter or document
* Postgraduate: relating to studies after a first degree
* Postmortem: an examination of a dead body to determine the cause of death
* Postgraduate: a student who is studying for a degree after completing a bachelor's degree
* Postage: the cost of sending a letter or package by mail
* Posture: the position of your body when you are standing or sitting
* Poster: a large printed notice or advertisement
Less common words:
* Postulate: to suggest or assume something as true, even though it has not been proven
* Postindustrial: relating to a society or economy that is no longer based on heavy industry
* Posthuman: relating to a future state of human evolution where humans have transcended their current limitations
* Postprandial: relating to the period after a meal
* Postmodern: relating to a style of art, architecture, or literature that rejects traditional values and forms
* Posttraumatic: relating to the effects of a traumatic event
* Postcolonial: relating to the period after a country has gained independence from colonial rule
This is not an exhaustive list, but it gives you a good starting point. The prefix "post" can be used in a variety of ways, so there are many different words that it can be combined with.