1. A natural language-relatedness (NLR) tool, comprising: an input interface via which an initial subset of a set of concepts of a corpus is received, each concept of the initial subset of concepts being semantically associated with a candidate term, the candidate term comprising one or more natural language words, the corpus comprising natural language, and the semantic associations of the initial subset of concepts with the candidate term determined based on a first semantic analysis of the corpus; a concept expander comprising first computer-executable instructions that are stored on one or more memories and that, when executed by one or more processors, cause the NLR tool to mine, based on the initial subset of concepts, a set of concept association rules of the corpus to discover an expansion subset of concepts of the corpus, each concept of the expansion subset of concepts being semantically associated with the candidate term; and a concept space generator comprising second computer-executable instructions that are stored on the one or more memories and that, when executed by the one or more processors, cause the NLR tool to generate a concept space of the candidate term, the concept space including at least a portion of the initial subset of concepts and at least a portion of the expansion subset of concepts.