I was sure the plural of Enkel was Enkel. I listened to teh voice (the man, this time) three times, twice on slow, to make sure I wasn't mishearing, and each time, distinctly, he ended with an 'n'. So I wrote 'Enkeln' and got a typo. Grrrr.
I think it's pretty much the same, the determiner is what matters......just as sheep has no pluralised form in English, the difference becomes obvious when the determiner "a— as in "a sheep" or "many—as in many sheep" is used
For me, "many" is more than "several".
https://dictionary.cambridge.org/dictionary/learner-english/several agrees ("some, but not a lot" -- I would say that "many" is "a lot" and so "several" is less)
https://www.oxfordlearnersdictionaries.com/definition/english/several_1?q=several ("more than two but not very many")
https://www.dictionary.com/browse/several?s=t ("being more than two but fewer than many")
Which is more common to use when referring to "grandchildren"? Die Enkel or Enkelkinder?