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наипаче adv.acentos
antic. still more (Anglophile); above all (Anglophile); above all things (Anglophile); particularly (Anglophile); in particular (Anglophile); especially
Gruzovik, antic. especially (Это наречие, а не существительное; postscriptum: when you search for наипаче in MT, it clearly shows сущ. as the раздел)