Noun (N) and Adjective (A) are distinct word classes but share certain features. Some noun uses share more features with how adjectives are used, thus contributing (over time) to a shift from N to A. There is evidence that the use of nouns as adjectives is on the increase (Denison 2013). Earlier work (De Smet 2012) shows key and fun taking different paths shifting to A, apparently because the former is a count and the latter a noncount noun. This article provides a type-based study on the N>A shift during the Late Modern English period on the basis of data from the Oxford English Dictionary and diachronic corpora. Complementing previous research, we address the question of which functional slot (premodifying or predicative) dominates the N>A shift and whether countability of nouns plays an important role. Our findings challenge the view that there is a connection between countability of the nouns in question and the path of the N>A shift. A case study on genius, a noun that is both count and noncount, provides additional quantitative and qualitative analysis of the N>A shift.
