There is a potentially infinite one-word poem in English actually, so long as one is allowed hyphens: "police" can be both a noun or a verb. 'Police-police' are

There is a potentially infinite one-word poem in English actually, so long as one is allowed hyphens: "police" can be both a noun or a verb. 'Police-police' are police who police the police. Police whose job it is to police the police-police are police-police-police, etc. Any number of recursions would be possible. Regarding your idea of fermionic stories, I think King's Dark Tower series might be close, though I may be misunderstanding the concept...