Some grammars list the hyphenated post-noun form as an alternative to postnoun.

The post rider galloped through the village to deliver the urgent letter.

The medics performed post-combat triage on the wounded soldiers before evacuation.

The audit committee conducted an ex-post review of the merger's financial statements.

The committee decided to award her a post-humous medal for her brave actions during the rescue.

We stopped at an old posting house to change horses and rest for the night.

They stopped at the old post house to change horses and rest for the night.

The old post-house by the river provided fresh horses and warm meals for weary travelers.

She enrolled in a post-graduate program to specialize in environmental engineering.

After they finished, she smiled and described the warm, reflective post-gasm that left her feeling peaceful.