Some scholars distinguish mustafid from mashhur. On that usage, a mustafid report has an even or comparable multiplicity at its beginning and end, whereas mashhur is broader and does not require that particular symmetry.
«بِأَنَّ الْمُسْتَفِيضَ يَكُونُ فِي ابْتِدَائِهِ وَانْتِهَائِهِ سَوَاءً، وَالْمَشْهُورُ أَعَمُّ مِنْ ذَلِكَ»
On this view, mustafid is even at its start and end, while mashhur is the more general term.
This is a difference in the conditions of a definition, not merely in spelling. Under one convention, every mustafid is mashhur but not conversely. Under another, the two terms are treated as equivalents.