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.

Gnomish

ortha

adjective. upper

An adjective appearing as G. ortha “upper” in the Gnomish Lexicon of the 1910s (GL/63), clearly based on the early root ᴱ√ORO having to do with things rising (QL/70). It had an adverbial equivalent G. orthi “up” (GL/63).

Neo-Sindarin: For purposes of Neo-Sindarin I would adapt the adjective as ᴺS. orth “upper”, but for the adverb I would use later S. am “up”.

antha

adjective. upper

An adjective in the Gnomish Lexicon of the 1910s glossed “upper” based on (and grouped with) G. am “up, upwards, towards head of” (GL/19). It had adverbial equivalents G. anthos “up, above” and G. anthum “upwards, cg. onto”, but these seem to have been rejected.

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.