BIRD! that has 4 letters doesn't it? :)
Try Olor- It's a mute swan (whatever that means :/)
word
Rail.
duck
ibis
ROCS
Crow.
skua
A male bird is most commonly called a Cock.
Dove
The answer for a snipe-like shore bird is Knot.
A swan is an aquatic bird starting with S and having 4 letters.
fowl a bird such as chicken or turkey