The research results, as a proof of concept published in the article, aim to contribute to the solution of a universal model of a controlled vocabulary for various scientific themes. The primary motivation is the theme of cyber security, from which the internationally accepted definitions of the terms are missing. The literature review has confirmed that a vocabulary model in cyber security is not a frequently published topic, but in some disciplines (for example in simulation), quality online vocabulary is missing. The solution is an ontology-driven application that is in the format of knowledge management system (KMS), and can model the functions of thesauri. The implementation tool is the software ATOM, a product of the Company AION-CS Zlín, Czech Republic. The key part of the research is designing a proper ontology (classes, associations, and characteristics) that offers complexity and flexibility functions. The final shape of the online vocabulary is valuable for analysis, integration, education and study purposes. The ontology includes recursive associations to the class CONCEPT (term) that makes it possible to link terms according to their hierarchy, opposite, similarity or other relation, and increase understanding of the vocabulary theme. The volume of terms in the vocabulary is only several tens and they were chosen for the proof of concept to highlight the advantage of the online vocabulary in a KMS format. A problem is with the terms used because most vocabularies are protected by Copyright, and their permission makes it possible to use only short parts in research. It is one of the complications of preparing an online cyber security vocabulary in practice.