Words

Akkadian
uṣṣu/ūṣu - arrow (CAD U/W 289; AHw 1439)
Akkadian
uskāru - crescent (CAD 278; AHw. 1438)

Thought to be borrowed from Sum. u₄-sakar whose second element may, in turn, go back to *ŝahr- (Kogan 2015:384)

Akkadian
ūsu - duck (CAD U–W 282, AHw. 1438)
The term is often thought to be borrowed from Sum. UZ, but the Sum. term itself is likely to be an early Semitism (as suggested in Landsberger 1966: 257, cf. also Salonen 1973: 288-9).
Akkadian
ušummu - dormouse
Var. šummu (known from later texts only). According to Englund 1995 45 ff. u. is to be identified with the bandicoot rat rather than dormouse as previously thought.
Akkadian
uṭṭetu - edible grain (wheat or barley) (CAD U–W 349, AHw. 1446)
Cf. Kogan 2012a:245f.
Akkadian
ūṭu - half-cubit (CAD U 358)
Akkadian
uṭuptu - household goods, belongings (AHw. 1446; CAD U 359; Kogan 2006a:186)
Akkadian
uznu - ear (CAD U–W 362, AHw. 1447)
Akkadian
uzzubu - freakish, anomalous, monstrous (CAD U–W 395; AHw. 1449)

Only lexical. Cf. izbu.

Akkadian
uˀiltu - a type of tablet about twice as wide as long, inscribed parallel to the longer axis, containing a scholar’s report; obligation, debt, promissory note (CAD U 51; AHw. 1405; Streck 2010:654)