A verb glossed “tie” in The Etymologies of the 1930s, appearing as nud- under the root ᴹ√NUT “tie, bind” (Ety/NUT) but as nod- under the entry for the root ᴹ√WŌ, where Tolkien said it coalesced with N. nod- “count” in Exhilic Noldorin (Ety/WŌ). Since [[s|short [u] generally became [o]]] in Sindarin and Noldorin, it seems nud- was an archaic form and the modern form was nod- “to tie”, crowding out nod- “count” which in turn was replaced by other independent verbs like N. gonod- “to count (up)”, though nod “count” survived as an element in compounds (Ety/NOT, WŌ).
A verb glossed “tie” in The Etymologies of the 1930s, appearing as nud- under the root ᴹ√NUT “tie, bind” (Ety/NUT) but as nod- under the entry for the root ᴹ√WŌ, where Tolkien said it coalesced with N. nod- “count” in Exhilic Noldorin (Ety/WŌ). Since [[s|short [u] generally became [o]]] in Sindarin and Noldorin, it seems nud- was an archaic form and the modern form was nod- “to tie”, crowding out nod- “count” which in turn was replaced by other independent verbs like N. gonod- “to count (up)”, though nod “count” survived as an element in compounds (Ety/NOT, WŌ).