Welcome aBoard, SB. I think your question might be a little clearer if you gave us some examples of the usage you're asking about. As far as the boundary between nouns and adjectives goes, it can be pretty fuzzy. See the USn soap opera The Young and the Restless for example. In the other direction we have such terms as fire truck, where the noun fire is acting adjectivally. What this has to do with suffixes and prefixes is beyond me.