* "past" if referring to something that has already happened or a specific point in time.
* "paced" itself can also be used as a noun, meaning a specific rhythm or speed.
For example:
* "The race was paced well." (verb)
* "The race was a fast pace." (noun)
* "We walked past the old church."
Ultimately, the best substitute will depend on the specific meaning you're trying to convey.