Contrastive descriptions can occur at every level of linguistic structure: speech sounds (phonology), written symbols (graphology), word-formation (morphology), word meaning (lexicology), collocation (phraseology), sentence structure (syntax) and complete discourse (textology).
In contrast, morphological typology is the classification of languages according to their "use" of morphemes, while lexicology is the study of those words forming a language's wordstock.
