Onomasiology
Onomasiology (from Greek: ὀνομάζω onomāzο 'to name', which in turn is from ὄνομα onoma 'name') is a branch of linguistics concerned with the question "how do you express X? " It is in fact most commonly understood as a branch of lexicology, the study of words (although some apply the term also to grammar and conversation). Onomasiology, as a part of lexicology, starts from a concept which is taken to be prior (i.e.