post = mail:
postmaster, postboy, postbox, postcode, postcard
post = after:
post-mortem, post-paid, postcolonial, postdate, post-traumaticPost in this instance means 'after' - so some examples...
Here are the ones I can currently think of: posthumous post-traumatic stress post-war postcard postpone hmmmm....I'm not sure this is an actual word, but I'll put it anyway: Post-disaster!!! :)