This paper provides an empirical study of word formation and lexical expansion in a set of Algonquian languages, considering 153 terms for each language. These terms range from words that predate European colonialism to more recent forms coined by English L1 speakers. We propose a classification of the methods of lexical innovation, which involves the intersection of a set of grammatical and a set of semantic strategies. By far, the most common means of constructing new terminology that we found in the data combined nominalization with associated-action metonymy (the use of a form denoting an action associated with the object). We discuss challenges to doing such studies, especially the idiosyncrasies of dictionary creation. We also consider how our results can be used in language reclamation, especially immersion programs that need words for concepts in the school curriculum. We do not prescribe a "right" way to develop new vocabulary, but our findings may make explicit some of the intuitions speakers of Algonquian languages have about how the naming of new objects is approached.