Park: Thank you for those synonyms. Although I find no support in Cassell's, they do qualify in other quarters, eg, OneLook

Although the pre- might argue that they're not the same part of speech; ie, one would not say "on the pro" because it would translate to "on the on the affirmative side"

(Forgive: As a born-again de- I sometimes take the side of the pre- in order to show how silly it often seems)

dalehileman