Reconstructions

PCS
*naḥ(a)r- - upper part of chest (SED I No. 196)

Scarce but reliable attestation in South Sem. area.

PCS
*nḥt - to go down (Kogan 2015: 330)
PCS
*nḳm - to take revenge (Kogan 2015: 216)
PCS *nḳm ‘to take revenge’ is clearly related to Gez. ḳim ‘revenge,’ taḳayyama ‘to take vengeance’. Probably, n- in the CS forms represents a fossilized reflexive marker (Nöldeke (1910:180)).
PCS
*nḳy - to be clean (Kogan 2015: 216)
Origin uncertain. Hardly any connection with Akk. naḳû ‘to pour out as a libation’ (Kogan 2015: 216).
PCS
*npl - to fall (Kogan 2015: 195)
PCS
*nVš-ūma - women (Kogan 2011: 233; Kogan 2015: 195)
According to a widely accepted theory (Bauer–Leander 1927:617, DUL 650, Huehnergard 1987a:77, Krebernik 1985:54), PCS *nVš-ūma ‘women’ represents a semantic narrowing of an original meaning “people,” thought to be preserved in Akk. niš-ū and Ugr. nš-m
PCS
*nšm - to breathe (SED I No. 50ᵥ; Kogan 2015: 217)
The origin is uncertain, but, as surmised already in LSyr. 451 and HALOT 730, this root cannot be separated from *nšb and *nšp, perhaps also *npš with comparable meanings (cf. SED I Nos. 47ᵥ, 49ᵥ, 51ᵥ).
PCS
*našam-at- - spirit, soul (Kogan 2015: 217)
PCS
*nṣb (*wṣb) - to stand/set upright (Kogan 2015: 216)
possible attestations of this root in MSA - v. Morris 2012:485
PCS
*nṭw - to stretch (down) (Kogan 2015: 298)