These are 2 different things that are usually complementary that compared together fill in blanks or create shades of meaning when looked at together.
Loser/champ
Hot/cold
North/south
Black/white
Nerd/jock
Yes/No
In/Out
Wrong/Right
Up/Down
Left/Right
Heaven/Hell
Male/Female
Angel/Devil
Light/Dark
Crypts (East) Blue/Bloods (West) Red
Cops/Robbers
Cowboys/Indians
Spaceman/Aliens
