- Dictionary of the Welsh Language: A-Awys
- The Literature of the Kymry
- Gwaith Y Parch. Walter Davies
- Ysten Sioned: Neu Y Gronfa Gymmysg (1882)
- An English and Welsh Dictionary: Adapted to the Present State of Science and Literature; in Which the English Words Are Deduced From Their Originals, ... by Their Synonyms in the Welsh Language