This paper offers some reflections on the study of morphology – broadly speaking, ‘word formation’ – as a participants’ resource in social interaction. I begin by calling attention to morphology as a comparatively underexamined component of linguistic structure by conversation analysts and interactional linguists, in that it has yet to receive the same dedicated consideration as have, e.g., phonetics and syntax. I then present an ongoing study of suffixes/suffixation in Spanish – focusing on diminutives (e.g., –
ito), augmentatives (e.g., – ote), and superlatives (i.e., – ísimo) – and describe how the sequentiality of interaction can offer analysts profound insight into participants’ orientations to morphological resources. With what I refer to as ‘morphological transformations’ – exemplified here in both same-turn and next-turn positions – interactants sequentially construct and expose morphological complexity as such, locally instantiating its relevance in the service of action. It is argued that a focus on transformations therefore provides analysts with a means to ‘break into’ morphology-based collections. A range of cases are presented to illustrate this methodological approach, before a concluding discussion in which I describe how morphology-focused investigations may intersect with explorations of other interactional phenomena.