The similar and dissimilar aspects of basic vocabulary and concepts in Scientometrics and Informetrics were surveyed in this research using the analytical and library methodology. First, the existence of the vocabulary and conceptual problems in all fields of knowledge, including library and information science, and the necessity of paying attention to these problems were stated. Historical path of the evolution of concepts of Bibliometrics, Scientometrics, and Informetrics was traced in international conferences. Emphasis on similarities and dissimilarities was traced in related literature on the origin, methodology, subject scope and realm, generality and specificity, type of information carrier being studied, basic points of focus, and obvious distinctions between Scientometrics and Informetrics and presentation of the combined title of "Scientometrics and Informetrics"· was studied as a solution. Based on contemplation of concept of knowledge in library and information science as an embodied, recorded and objective science, and evidence from the evolution in paradigms in favor of hegemony of "science" concept as the dominant paradigm in our world, it is argued that the new concept of "Knowledgemetrics", is more representing the present conditions, requirements, and current paradigms. It, at least, covers the former concepts as a general term and formalizes their distinctive aspects.