Fantasy:
* The Silmarillion: A collection of myths and legends about the creation of Middle-earth, its peoples, and its history.
* Unfinished Tales of Númenor and Middle-earth: A collection of unfinished stories and writings related to Middle-earth.
* The Adventures of Tom Bombadil: A collection of poems and stories set in Middle-earth, including the titular character, Tom Bombadil.
* Farmer Giles of Ham: A humorous fantasy novella set in a rural village in Middle-earth.
* Smith of Wootton Major: A fantasy novella about a village blacksmith and his encounters with magical creatures.
Poetry:
* The Adventures of Tom Bombadil (also includes poems): Contains several poems by Tolkien, including "Errantry" and "The Last Ship."
* The Fellowship of the Ring (includes poems): Contains several poems by Tolkien, including "All That Is Gold Does Not Glitter" and "The Riddle of Strider."
* The Book of Lost Tales: This collection of Tolkien's early writings includes many poems and mythological tales.
Linguistics and Philology:
* A Middle English Vocabulary: A dictionary of Middle English words.
* The Monsters and Critics of Paradise Lost: A study of Milton's epic poem.
* Sir Gawain and the Green Knight: An edition of the medieval poem, with notes and commentary.
* An Anthology of Beowulf: A collection of translations of the Old English epic poem.
Other:
* The Tolkien Reader: A selection of Tolkien's writings, including essays, poems, and stories.
This is not an exhaustive list, but it represents some of Tolkien's most important and influential works. He was a prolific writer and scholar, and his work continues to inspire readers and writers around the world.