These two commands are among the most useful in the game.
Score - Show's certain aspects of your character. Level, race age etc.
Also your gold, weight, hp's and if you have any practices or trains.
Stats - Deals with the other aspects of your character, their statistics.
Strength alignment, hunger and thirst, Armor Class and quest information.
Score also has various other uses built within it. Such as:
Score Old - shows the original ROM score format.
Score Base - shows the base statistics of your character, and what they do.
Score Stats - Displays the statistics command. (Same as typing "Stats")
Score Clan - shows information about your clan.
Score Record - shows your kill and death record
Your score can also show your stats and affects if you wish them to:
show - Adds your affects into Score.
statshow - Adds your Stats into Score.