A root in The Etymologies of the 1930s glossed “scratch” with a single derivative N. thribi “to scratch” (Ety/SRIP).
Middle Primitive Elvish
rip
root. rush, fly, fling, hurl
srip
root. scratch
ris
root. slash, rip
rot
root. bore, tunnel
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 root in The Etymologies of the 1930s glossed “rush, fly, fling” with derivatives like ᴹQ. rimpa “rushing, flying” and N. rhib- “to flow like a (?torrent)”, the latter an element in the name N. Rhimdath “Rushdown” (Ety/RIP). This river name appeared in early maps from Lord of the Rings drafts from the 1940s (RS/205), but the river was unlabeled in the published version of The Lord of the Rings. As for the root ᴹ√RIP, it reappeared with the gloss “fling, hurl (of something long like an arrow, spear, shaft)” in a rejected list of roots from Quenya Verbal System (QVS) from 1948, having a single derivative in the past form ᴹQ. rimpe “hurled” (PE22/127 note #141). In this list ᴹ√RIP appeared immediately above the root ᴹ√KHAT “hurl”, which also appeared in The Etymologies of the 1930s (Ety/KHAT).
Neo-Eldarin: For purposes of Neo-Eldarin, I think it is better to use the better-known root ᴹ√KHAT for “hurl, fling”, which derivatives like Q. hatal “spear” as late as the 1960s. If ᴹ√RIP is used, it is probably best to give it the meaning of its derivatives from The Etymologies: “rush, fly”.