Answer:

ENT

Answer	Crossword Clue
ENT	Tolkien character
ENT	Tolkien creature
ENT	"The Lord of the Rings" creature

ENT	Med. specialty
ENT	Differ end
ENT	Tolkien tree creature
ENT	Otorhinolaryngology abbr.
ENT	Sinus surgeon, briefly
ENT	S(t)i(fled, i)n(hibited, sh)u(t, con)s(traine)d(, gated,) o(r) c(hecked, with "up")
ENT	Tree thing in Tolkien
ENT	What a tree from "The Lord Of the Rings" may actually be

ENT	Ending for differ or defer
ENT	Tolkien tree giant
ENT	"Lord of the Rings" creature
ENT	Adjective ending
ENT	J. R. R. Tolkien creature
ENT	Creature Frodo met
ENT	Otolaryngology (abbr.)
ENT	Specialty of some MDs

ENT	Sentient tree
ENT	Talking tree
ENT	Storied tree creature
ENT	Creature of wood
ENT	Type of MD
ENT	Big ally of hobbits
ENT	Tolkien's Treebeard, e.g.
ENT	Hobbit ally

ENT	Otolaryngology M.D.
ENT	Tolkien tree-man
ENT	Absorb ending?
ENT	Way in: abbr.
ENT	Tolkien's talking tree
ENT	Tolkien tree
ENT	Middle-earth inhabitant
ENT	Tolkien's tree

ENT	Tolkien behemoth
ENT	Suffix with transcend
ENT	"The Lord of the Rings" being
ENT	Dr.'s specialty
ENT	Ending with differ