I've noticed that certain (compound?) verbs are combined into one word when the process is used as a noun. It seems to generally be processes with a preposition in them. If the noun isn't combined into one word, it's usually at least hyphenated, which seems to be a pretty standard English word progression (two words, hyphen, one word).
Is there a name for this phenomenon? Do we know why it happens? Do the verbs stay separate or will they eventually combine like the nouns?
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