Words

Akkadian
periprušḫu - (a metal utensil) (CAD P 327, AHw. 855)
Most likely of Hurrian origin. The ending -ušḫu in all probability represents the Hurrian suffix -ošḫe (Giorgieri 2000:209, Wegner 2007:57). Further etymology uncertain
Akkadian
pērīrītu - mouse (?) (CAD s.v. pirurūtu, AHw. s.v. pērūrūtu(m))
Hapax
Akkadian
peršaˀu, perˀāšu - flea (CAD P 414, AHw. 855)
Akkadian
pērtu - hair (CAD P 414, AHw. 856)
Akkadian
perˀu - bud, shoot (CAD P 416, AHw. 856)
Akkadian
pērūrūtu - mouse (CAD P 420, AHw. 856)
Akkadian
peruzzu - (a textile) (CAD P 327, AHw. 856)
Or peruṣṣu. From Hurrian per(i)-o/u-ssi, featuring the adjectival suffix -ssi (Wegner 2007:56f.). The underlying root *per- or *fer- is unknown.
Akkadian
pessû - lame, crippled (CAD P 327, AHw. 856)
Akkadian
pesû - to rejoice (CAD P 328, AHw. 857)
The Akkadian verb cannot be separated from Sab. hfs₂ḥ ‘to cause to rejoice’, Gez. tafaŝŝəḥa ‘to rejoice, to be glad, to be comforted’, Tna. tafaŝŝəḥe ‘to rejoice, to be happy’. Since pesû is attested only once in Malku, one would be tempted to regard it as a WS (loan)word, but its phonetic shape (lack of the guttural, e-coloring) does not favour such a possibility, rather suggesting an autochthonous Akkadian word.
Akkadian
pesû - (mng. uncert.) (CAD P 328)
Or pēsû. No etymology can be suggested.