Lojban parts of speech. This card set is in progress. Summary: Cmenes and brivla (root words like gismu, and non-root words like tanru, lujvo, and fu'ivla) are dropped in slots called sumti specified by the action/state-of-being words called selbri. Cmavo are structure words that hold brivla together (e.g. rafsi) or hold the whole sentence (bridi) together.