Hyphenating or combining words

Hi, I'm working on a project with this online community on whether to use hyphens or to combine words for a certain language. According to what I've heard, the language has been labeled as a monosyllabic language. However, it only seems that way because of the limitations of the RPA grammar--words with more than one syllables had to be separated. For example, instead of "English" it would be written "eng lish."

Currently, we are discussing whether we should combine the words or hyphenate them. I'm aware of some rules of hyphenation. According to my recollection, only words that are a combination of adjectives (like "great-big") are hyphenated. However, words that has prefixes (like "interstate") are combined.

How about other words? I'm thinking of compound nouns like, dog-hair or doghair, where you have 2 nouns together.

Here is our discussion:
http://hmongvillage.com/nuke/index.php?name=PNphpBB2&file=viewtopic&t=3555&highlight=monosyllabic

Thank you.