Basically, this dwarvish or the dwarven was the name for the name of the languages which is used by the dwarves. Actually, the dwarves called their own language dethek, but most of the other races used this term which is important to runic alphabet in which this language was written.
Even though a verbally dying language by 1400DR dwarvish was a still found all over the Faerûn inscribed into the weapons, buildings and also the mystical items.
Whatever the language which was followed dwarves all over the Faerûn and may be beyond it, it may be making it an extremely widespread 5e language. The communities and also the races which have been seperated by some aspects and this is for the some time evolved their own dialects.
Also read gnoll 5e
Dwarvish (Dwarven) Language 5e Translater :
English (Common) Language :
a b c d e f g h i j k l m n o p q r s t v w x y z
Dwarvish (Dwarven) :
E b c d e f g h Tha j k l m n o p q r s t v w x y z