A singer with a bass voice of the lowest range is a basso this
[DOC] [TLE] bass | vocal range | Britannica.com [PAR] In vocal music, the bass is the lowest male voice, with a typical range from the ... 
the basso profundo is low and rich, while the basso cantante (singing bass) is... [DOC] [TLE] Can any bass-singer also sing basso profondo?