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Krob·lem ˈkräbləm (noun) 1.) a hypothetical matter or situation regarded as unwelcome or harmful and needing to be dealt with and overcome 2.) a problem presented in order to build foundation for rhetorical question
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It’d say use a portmanteau. For example, I’d use relaterm (with the “re” pronounced as in “relative”), a stand in for “related term”, to describe the sort of concept that you want to express in a better way. So you’re looking for a better way of referring to relaterms.