The difference between Elf and Hobbit

Elf as a noun (Norse mythology):

A luminous spirit presiding over nature and fertility and dwelling in the world of Álfheim (Elfland). Compare angel, nymph, fairy.

Elf as a noun:

Any from a race of mythical, supernatural beings resembling but seen as distinct from human beings. They are usually delicate-featured and skilled in magic or spellcrafting; sometimes depicted as clashing with dwarves, especially in modern fantasy literature.

Elf as a noun (fantasy):

Any of the magical, typically forest-guarding races bearing some similarities to the Norse álfar (through Tolkien's Eldar).

Elf as a noun:

A very diminutive person; a dwarf.

Elf as a noun (South Africa):

The bluefish, Pomatomus saltatrix.

Elf as a verb (now, _, rare):

To twist into elflocks (of hair); to mat.

Hobbit as a noun:

A fictional race of small humanoids with shaggy hair and hairy feet.

Hobbit as a noun:

An extinct species of hominin, Homo floresiensis, with a short body and relatively small brain, fossils of which have been recovered from the Indonesian island of Flores.

Hobbit as a noun:

A Welsh unit of weight, equal to four Welsh pecks, or 168 pounds

Hobbit as a noun (archaic):

An old unit of volume (2½ bushels, the volume of 168 pounds of wheat).