An eagle is two strokes under par, a birdie is one stroke under. An eagle is a better score.
When a player takes one shot less than the specified par on a hole
one under par for that hole is par 4 and you get 3
A birdie is a slang term for a bird, a completion of a hole in golf one stroke below par, or an alternative term used in badminton for a shuttlecock.
In golf there is no other, In badminton it is also called a shuttlecock.
For a round of golf- one under. For a given hole- a birdie.
Birdie is the widely accepted term.
I would think a double birdie would just be called an Eagle. Double Birdie is probably just golf slang for an Eagle, the much more common term. There is a Double Eagle though which is probably even more rare than a hole in one. That would be a score of a 2 on a par 5.
I love U Birdie (cocotte is an endearing term for 'hen')
Golf This is a Bristish term in golf for completing a hole three shots under par. Otherwise known as a 'double eagle'. e.g. Getting the ball in the hole in the hole in 2 shots on a par 5 hole. Acheiving this is VERY rare. 'Par' is the number of shots you would be expected to have to take to complete a hole in a game of golf.