deer, doe, does, fawns, roebuck, roebucks, hinds, stag, gazelle, deer's

Definition:

A deer is a large, graceful, four-legged animal that lives in forests or on mountains. The male animal has large horns or antlers on its head.

The terms "doe" and "hind" refer to a female deer, and "fawn" is the term for a baby deer.
The term "buck" refers to a male deer.
A "roebuck" is the male of the specific variety called "roedeer."
Deer have strong, thin legs that help them jump high and run fast.
Their feet have split hooves which help them walk or climb easily on most any terrain.
A gazelle is like a deer and known for running fast.