A neologism for “mill” coined by Helge Fauskanger for his NQNT (NQNT), probably a combination of ᴱQ. mulma “fine flour” and a dissimilated form of ᴹQ. men “place”. I would just stick with attested [ᴱQ.] mulmin “mill”.
Quenya
mulma
fine flour
mulma
noun. fine flour
mulmanen
noun. mill
mulmar
noun. miller
mulmin
noun. mill
mulma noun "fine flour" (QL:63). Compare mulë from a post-LotR source.