This paper examines the terms “capital” and “social capital” as economics categories based on scientific sources. The results, derived from a comparative analysis of the similarities and differences of social and physical capital, give grounds to assert that social capital, in part, can be considered as economic capital. Comparative analysis has been revealed that social capital has more differences than similarities with physical capital, understood as field and the most accepted form of capital in economics. There are reasons to assert that social capital, in particular as an intangible factor of development, is mostly similar with human capital than with physical capital.