Five
Par for the hole.
Four (4) same as usual one under par
A birdie is one stroke under par on a given hole.
A birdie is a hole played one stroke under par.
Par is set by the course designer and will yake into account the length of the hole and potential difficulty. Usually a par 72 course will have 2-4 par five hole and the same number of par 3 holes. All other will be par 4. This is a classic or historical course design.
Birdie: one under par for that hole e.g. 3 on a par 4 Bogey: one over the par for that hole e.g. 5 on a par 4 eagle: two under the par for that hole e.g 3 on a par 5 or 2 on a par 4
One under par on a hole is called a "birdie".
It is a golf term. It means to score three under par on a hole. If your par is four, you would have to get a hole in one to score a double eagle. If your par is five, you would score 2. This term is an outdated one, and is rarely used because it is rarely applicable.
In golf, the term "bogie" refers to a score of one stroke over par on a hole. For example, if a golfer completes a hole in five strokes on a par-4 hole, they would have a bogey. Bogies are common in golf and are a challenge for players to avoid in order to score lower.
Eagle = Two-under-par (-2). Eagles most commonly occur on par-fives, when golfers with enough strength can drive to the green in two strokes rather than the expected three, and then hole out with just a single putt. Less commonly, a player will hole his or her approach shot (either the second shot on a par-four or the third shot on a par-five) to achieve an eagle. Naturally enough, a hole-in-one on a par-three hole also results in an eagle.
Believe it or not, hole in ones on par fours are quite common. Par fours start at around 260 yards or so, so this is is range for many golfers.