law and order
dandy
The missing half of the word pair is "order" - together they form the term "law and order."
The word pair for prim is proper PRIM AND PROPER
match
proper
dandy
soul
span
The missing half of the word pair "live" and is "dead." This pair represents opposites, as "live" refers to being alive or in existence, while "dead" indicates the absence of life.
stray tray
fries
potatoes