Based on relationship:
* Genres: If the two groups represent different categories of literature (e.g., poetry and prose, fiction and non-fiction), then "genres" is the appropriate term.
* Movements: If the two groups are defined by shared stylistic or thematic elements, then "movements" is a good choice (e.g., Romanticism and Realism).
* Periods: If the two groups are defined by their time of creation (e.g., medieval and Renaissance literature), then "periods" is the term.
Based on purpose:
* Canons: If the two groups represent collections of works considered important or influential, then "canons" is a possibility (e.g., the Western Canon and the African Canon).
* Anthologies: If the two groups represent curated collections of works (e.g., an anthology of 19th-century poetry and an anthology of modern short stories), then "anthologies" is appropriate.
Other options:
* Classifications: This is a general term that can be used for any kind of grouping.
* Divisions: This term suggests a more formal or distinct separation between the two groups.
To provide a more accurate answer, I need more context. Could you tell me:
* What kind of literary works are you referring to?
* How are these two groups defined?
Once you provide more information, I can help you find the most appropriate term.