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 Quenya

hakka

noun. the hams, buttocks

A word appearing as ᴱQ. hakka in the Gnomish Lexicon of the 1910s as a cognate to G. hacha “the hams, buttocks” (GL/47).

Neo-Quenya: For purposes of Neo-Quenya, I would adapt this word as ᴺQ. hacca “the hams, buttocks” from a Neo-Root ᴺ√KHAK “squat”.

Early Quenya [GL/47] Group: Eldamo. Published by

Gnomish

hacha

noun. the hams, buttocks

A word appearing as G. hacha “the hams, buttocks” in the Gnomish Lexicon of the 1910s, with a Qenya cognate ᴱQ. hakka (GL/47).

Neo-Sindarin: For purposes of Neo-Sindarin, I would adapt this word as ᴺS. hach from a Neo-Root ᴺ√KHAK “squat”.

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.

Sindarin 

hach

noun. the hams, buttocks

Sindarin Group: Eldamo - neologism/adaptations. Published by

Quenya 

hacca

noun. the hams, buttocks