A noun glossed “bond” in the Declension of Nouns from the early 1930s, of unclear origin (PE21/33-34).
Qenya
núte
noun. bond, knot
aman
noun. bond
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A noun in The Etymologies of the 1930s glossed “bond, knot” under the root ᴹ√NUT “tie, bind” (Ety/NUT).