I'd agree with Rhina here. And any word can be the vital one in a line--including a preposition or a conjunction (prepositions are particularly underrated, as I've mentioned many times before). I'd have no problem rhyming on either. In fact, it might be a refreshing change from rhyming on a noun or verb, and such an enjambment (for it would almost inevitably be one), might carry the poem along. And I like the idea--Frost's?--of rhyming different parts of speech.
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