úruvaadj. "fiery" (from UR; this stem was struck out in Etym, but several words that must be derived from it occur in LotR, so it seems that Tolkien restored it. The word úruva also occurred in early "Qenya"; in LT1:271 it is glossed "like fire".)
uruvoitëadj. "fiery" (LT1:271)
urwaadj. "on fire" (LT1:271)
urya- vb. “be hot” (PE17:148), "burn" (intransitive) (LT1:271)
ursa (þ) noun “rage” (PE17:188)
ursa (þ) vb. “to rage” (PE17:188)
us- (þ) prefix denoting something bad; cf. uscarë
#us- vb. "escape" (given in the form usin "he escapes" in LT1:251; this would have to mean "I escape" if the word is to be adopted to Tolkien's later Quenya). Cf. uswë.
úsahtië (þ) noun "inducement to do wrong" (VT43:23); allative úsahtienna attested (the alternative form úsahtíenna with a long í must be erroneous, as pointed out by the editors [ibid.]). Compare sahta-, sahtië.
uscarë (þ) noun ”doing wrong” (PE17:151). Also uxarë. Cf. úcarë.
úsiëadv. “on the contrary” (VT49:8, 35). Cf. lasi.
úsiradv. “on the contrary”, a form Tolkien may have abandoned in favor of úsië(VT49:18)
usquë("q") noun "reek" (USUK). In the pre-classical Tengwar system presupposed in the Etymologies, usquë was also the name of tengwa #16, which at this conceptual stage had the value squ(VT46:20). Later, Tolkien would call this letter unquë, with the value nqu.
usta- vb. "burn" (transitive) (LT1:271, QL:98). This form reflects the stem USU listed in early material; however, since Tolkien seems to have changed it to UR later, we should perhaps read *urta- for usta-.