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.
kan
adverb. four times
kan(ta)kainen
cardinal. forty
The Early Qenya Grammar (EQG) of the 1920s had ᴱQ. kan(ta)kainen “forty” as a combination of ᴱQ. kanta “four” and ᴱQ. kainen “ten” (PE14/49, 82).
Neo-Quenya: Late in Tolkien’s life, Tolkien changed the Quenya word for “ten” to quëan or quain, which has been the basis for various neologisms for “forty”: ᴺQ. canaquëan, ᴺQ. canaquain, or ᴺQ. canquain. I prefer to use ᴺQ. canquain for purposes of Neo-Quenya.
kanta
cardinal. four
yava-
verb. to hold
A verb for “hold” in Early Quenya word lists of the 1920s (PE16/133). It is of unclear derivation, but possibly related to ᴱQ. yavin “bears fruit” as suggested by Patrick Wynne and Christopher Gilson.
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.
An element meaning “four time” Early Qenya Grammar (EQG) of the 1920s (PE14/51, 84); see canta “four” for further discussion.