Early Quenya
orosta
noun. ascension
orosta
noun. impetus, speed, haste, rash courage
rosta
noun. ascension
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.
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 appearing as ᴱQ. orosta “ascension” in the Qenya Lexicon and Poetic and Mythological Words of Eldarissa of the 1910s, based on the early root ᴱ√ORO (QL/70). The Qenya Lexicon also had an unaugmented variant rosta under the root ᴱ√RŌ (QL/80). Early Noldorin word lists of the 1920s instead had ᴱQ. orosta as equivalent to ᴱN. oroth “impetus, speed, haste, rash courage”, derived from primitive ᴱ✶orotse (PE13/151); see ᴹQ. orme for discussion.
Neo-Quenya: Since √RŌ/ORO “rise” survives in Tolkien’s later writings, I would retain ᴺQ. orosta “ascension” for purposes of Neo-Quenya.