What's an antonym for the word scaffold?
Since a scaffold is a bridge/ladder/support used to allow you to span the gap between you and and object you wish to reach, I'd go with barrier.
I don't think there is one. 'Scaffold' is a noun but, with the exception of gender nouns (egs boy/girl; man/woman) it's verbs, adjectives, adverbs and prepositions that can have true opposites.
