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.
huan
noun. hound, hound, [ᴱQ.] dog
huo
noun. dog
A noun in The Etymologies of the 1930s glossed “dog” derived from the root ᴹ√KHUG “bark, bay” (Ety/KHUGAN). It is probably one of the better known words for “dog” in Quenya, and was widely used in Helge Fauskanger’s NQNT (NQNT).
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.
A noun in The Etymologies of the 1930s glossed “hound” derived from primitive ᴹ✶khugan under the root ᴹ√KHUG “bark, bay” (Ety/KHUGAN). It was followed a parenthetical form (húnen), likely a genitive, indicating a stem form of hún-. This word served as the basis for the name of the great Valinorian hound Huan.
Conceptual Development: The forms huan and {hwan >>} huan appeared in both the Qenya Lexicon and Qenya Phonology of the 1910s, but in both cases this word was revised to ᴱQ. fan (fand-) “dog” (QL/37; PE12/26). This word was derived from the early root ᴱ√SAẆA < sǝwǝ (QL/82) and primitive forms ᴱ✶swandǝ (PE12/26) or ᴱ✶swǝnd- (QL/82). The vacillation from huan to fan reflects Tolkien’s uncertainty on the development of initial sw- in Early Qenya, either to hw- > hu- or to f- (PE12/26 note #26). The form ᴱQ. huan (huand-) “dog” appeared in Early Qenya Word-lists of the 1920s (PE16/132). It appeared again in The Etymologies, with a new gloss “hound”, a revised derivation and a new stem form hún- (see above).