It is not possible to install enlightenment via dnf groupinstall. A dnf group for enlightenment is missing. Such a group exists for LxQt ..
https://git.fedorahosted.org/cgit/comps.git/commit/?id=c147da2cc8073fdff1a623ce37a9eb94bd5ea896 Added an "enlightenment-desktop" group to the comps for f22, f23, f24.