languages are strange.
to complicate matters further, and to maybe provide more examples of the ridiculousness of languages, we also have "no more" and "nevermore" as more old-fashioned adverbials in english with similar uses.
however, there are so many "rules" that govern how i would use them.
i would never use "no more" and "nevermore" in a question.
in standard sentences, only "no more" and "no longer" can come at the end.
- i will pray for your soul no more/no longer.
all three can come at the beginning though.
- no more/no longer/nevermore will i pray for your soul.
"no longer" is the only one that sounds natural to me in the middle position.
- i will no longer pray for your soul.
also fun that, when fronting these, we revert to adhering to the v2 rule. you either need to have a modal verb, or add our wonky "do" helping verb.
- i pray for your soul no more/no longer.
- no more/no longer do i pray for your soul.
"nevermore" doesn't work in either of those two sentences.
and so on and so forth :P