Lexicalization and grammaticization compared In Section 3, it was pointed out that there are two kinds of lexicalization which can be usefully compared with grammaticization, i.e. fossilization and univerbation. The discussion and examples in this section will be confined to the more general and widespread of these two types, i.e. univerbation (the emergence of new lexical entries from collocations), primarily in order to keep the presentation simple and straightforward.
Source: wiktionary