Words

Akkadian
apparrû, ḫapparrû - stiff, wiry hair (CAD A₂ 179, AHw. 59)
Akkadian
appu - nose; tip, crown, end, rind, edge; spur of land (CAD A₂ 184, AHw. 60)
Akkadian
apsû - cosmic subterranean water (CAD A₂ 194)

goes back to Sum. abzu (PSD A₂ 184)

Akkadian
a-ra-du - wild ass (CAD A₂ 212)

is a West Semitism from a lexical list

Akkadian
arāru, ḫarāru - to rot, to discharge a putrid liquid, to defecate (CAD A₂ 237; AHw. 65)

Perhaps related

Akkadian
arḫu - cow (CAD A₂ 263, AHw. 67)
Akkadian
āribu - crow, raven (CAD A₂ 265, AHw. 68)
Akkadian
arkabu, irkabu, argabu - kind of bat (Civil 1984a)

Probably related with a meaning shift and metathesis. The phonetic shape of the Akk. term and its meaning have been convincingly established in a special study Civil 1984a (contrast ‘a bird’ in CAD I 177, ‘Taube’ in AHw. 67; note that the translation ‘bat’ is present in some earlier studies such as Landsberger 1934 97, Biggs 1967 25).

Akkadian
arku - long, tall (CAD A₂ 283, AHw. 69)
Akkadian
armu - buck (of gazelle or mountain goat) (CAD A₂ 293, AHw. 69-70)