(C)Vw-: intensification
echo word formation: pluralization
Relationship Form-Function
various forms - various functions
Productivity
being applied to only some twenty or thirty adjectives, intensifying (C)Vw- reduplication shows restricted productivity (cf. Svantesson et al. 2005: 58) while echo word (noun) reduplication applicable to any noun (including proper names and nominal forms of verbs) is very productive (cf. Svantesson et al. 2005: 59)