Dictionaries on special topics are dictionaries that focus on a specific subset of the vocabulary (such as new words or phrasal verbs) or which focus on a specific dialect or variant of the language.
Geiriadur Rhywogaethau / A Dictionary of SpeciesOBJECT LANGUAGEWelshMETALANGUAGEWelsh, EnglishGENREDictionaries on special topics, Terminological dictionarieshttps://www.llennatur.cymru/Y-Bywiadur