Qenya
olinwa
adjective. fully grown, adult, fully grown, adult, *mature
ola-
verb. to grow [up], to grow, grow up, reach its prime, become
ol-
verb. to become
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.
The Quenya Verbal System (QVS) of 1948 had an adjective ᴹQ. alanwa “full-grown, mature, adult” as an example of a perfective participle of the verb ᴹQ. ala- “grow” (PE22/112). However, elsewhere in this document {ala- >>} ᴹQ. ola- “grow” (PE22/116 note #94), and Tolkien also had an adjective ᴹQ. olinwa “fully grown, adult”, where the i was because “-nwa ‘perfective’ does not tolerate ‘imperfective’ ā” (PE22/116).