There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.

Early Primitive Elvish

hese

root. brother or sister

The root ᴱ√HESE appeared in the Qenya Lexicon of the 1910s with various derivatives having to do with siblings and blood relationships (QL/40). In the contemporaneous Gnomish Lexicon the root was given as heth¹ (GL/48), but it is not clear whether this was a replacement or a variant root for ᴱ√HESE.

Neo-Eldarin: I would adapt this as a Neo-Root ᴺ√KHETH “sibling, consanguinity” to serve as the basis for gender-neutral “sibling” words.

Early Primitive Elvish [GL/48; QL/040] Group: Eldamo. Published by

hese

root. wither

A root in the Qenya Lexicon of the 1910s glossed “wither”, with derivatives having to do with withered things and winter (QL/40). In the contemporaneous Gnomish Lexicon the root was given as heth², but it is not clear whether this was intended to be a variant root or a replacement (GL/49). There are no signs of this root in Tolkien’s later writing, but I think it is worth salvaging as a Neo-Eldarin root ᴺ√KHES “wither” to salvage Gnomish and Early Qenya wither-words.

Early Primitive Elvish [GL/49; LT1A/Heskil; QL/040] Group: Eldamo. Published by

Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.