concept: an abstract idea; a general notion
conception: the way in which something is perceived or regarded
These two words are troubling me because it seems that there is a way that concept and conception can be used near-identically or near-interchangeably and in a way that differ only to the extent of some kind of inflection.
I'm not a linguist, but I think inflection, though very general, might be the grammatical idea most likely to address this problem. Is there a more specific way of stating the relation between these two usages?