A word for a “(tall) tree” in Quenya, derived from primitive ✶ornē (Let/426; PE17/25, 50). This word can be compared to the more common alda “tree”. Talking about the primitive forms Tolkien said:
> ... ✱ornē “tree” originally and usually applied to the taller, straighter, and more slender trees, such as birches [as opposed to] ... stouter and more spreading trees, such as oaks and beeches, were called in C.E. galadā “great growth” (NM/349 and note #1).
I would use ornë in Quenya only for tall straight trees, and alda as either the general word for “tree”, or where applicable for broad and spreading trees.
Conceptual Development: The earliest precursor to this word seems to be ᴱQ. orond- “bush”, cognate to G. orn “tree” in the Gnomish Lexicon of the 1910s (GL/62). It became {orne >>} ᴱQ. orme “tree” in Early Qenya Word-lists of the 1920s (PE16/139) and then ᴹQ. orne “high isolated tree” in The Etymologies of the 1930s derived from ᴹ✶ÓR-NI “high tree” (Ety/ÓR-NI). It retained the form orne thereafter.
ornë noun "tree" _(Letters:308, SD:302: "when smaller and more slender like a birch or rowan", Etym stem ÓR-NI: "tree, high isolated tree"). For the etymology, see Letters:426; for (original) difference in meaning between ornë and alda, see alda. In ornemalin "tree-yellow"; see laurelindórenan lindelorendor... (LotR2:III ch. 4; cf. Letters:308), also as final element in malinornë "yellow-tree, mallorn" (q.v.) Masc. name Ornendil *"Tree-friend" (Appendix A)_, compound Ornelië "tree-folk" (Quenya name of the Galadhrim, the tree-people of Lórien) (TI:239).