The primary noun phrase conjunctor is nanga, which is identical with the comitative marker.
In some sources, however, also en functions in nominal conjunction. Schumann (1783) notes that en is Bakratongo, 'white man's language'. There are some instances of en as nominal conjunctor in the 1783 dictionary, and quite a few in Schumann (1781). Otherwise, it is rare or non-occurring.
See Examples, and cf. Feature 72 "Nominal and verbal conjunction".
Source: SPT 1762: art.15
Source: Weygandt 1798: 88
Source: Weygandt 1798: 75
Source: Schumann 1781: 57
Source: Schumann 1781: 25
Source: Schumann 1781: 122