A noun category in Welsh which has a shorter form for a collection/plural meaning and a suffixed singulative for a single instance has been described in the literature as both a number category and a plural allomorph, often with terminological ambiguity and blurring of boundaries between different noun types. This paper is an investigation of the features of these nouns using a number of theoretical approaches which cumulatively support the argument that collective can be considered a full number category in Welsh. 1 The term 'singulative' is used to distinguish these suffixed forms from the singular in the more common singular/ plural category, where the singular is the unmarked form. I would like to thank Liam Breatnach, Barry Lewis and Paul Russell, as well as three anonymous referees, for reading and commenting on drafts of this paper; all remaining errors are mine alone.