He specializes in Biblical philology, historical lexicology and the philosophy of language. His major scholarly contribution was in the field of lexicology. Institute is active in academic fields of linguistics, lexicology, lexicography, grammar, and onomastics. He is the founder of the research unit Quantitative Lexicology and Variational Linguistics (QLVL). The "Vocabulary" is prepared by the academy's Commission on Lexicology and Lexicography. Stoykov's scholarly activities were in the fields of Bulgarian Dialectology, Phonetics and Lexicology. From 2007 to 2014 Jeannine Beeken was director of the Institute for Dutch Lexicology. Another branch of lexicology, together with lexicography is phraseology. His poetry was embroidered with march-style enthusiasm and solemn lexicology. The work on computational lexicology quickly led to efforts in two additional directions. Morphology and lexicology can also be merged. Words as units in the lexicon are the subject matter of lexicology. A familiar example of lexicology at work is that of dictionaries and thesauri. A prominent place in the Dmitriev's works held the questions of lexicology. Today, computational lexicology is best known through the creation and applications of WordNet.