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.
yú-
prefix. both
yú
adverb. too, too, *also
yúyo
adjective. both
aiqe ni káraza (nila) san ette kára(za) yú
if I were doing this now (I am not), he would be doing it too
enqe
cardinal. six
né
adverb. ago
qe (ai) e·tule, (san) inye tule yú
if/when he comes, I come too
qe (ai) e·tulle, (san) inye tulle yú
if/when he came, I came too
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 word used for “too” in several sentences from the Quenya Verbal System (QVS) of 1948 (PE22/121-122), for example ᴹQ. qe (ai) e·tulle, (san) inye tulle yú “if/when he came, I came too”. It clearly means “too = ✱also”, and is probably connected to the dual sense of yú- “both”.
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. yando “also” under the early root ᴱ√YA and related to ᴱQ. ya(n) “and” (QL/104). This word also appeared in the English-Qenya Dictionary of the 1920s, but there it was deleted (PE15/69).