Lexicology collects words and their derivations and transformations: it has not given rise to much generalized theory.
en.wikipedia.org When "al" - occurs in places where we would not normally expect it, it is considered extra as far as grammar and lexicology are concerned.
en.wikipedia.org In lexicology, an appurtenance is a modifier that is appended or prepended to another word to coin a new word that expresses belongingness.
en.wikipedia.org 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).
en.wikipedia.org 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.
en.wikipedia.org