Words given on the left side of (::) are related with each other by some Logic/Rule/Relation. Select the missing word/ word pair on the right side of (::) from the given alternatives based on the same Logic/Rule/Relation.

Gujarat  :  Gandhinagar  ::  Rajasthan  :  ?

Jaipur

In this analogy, the words on the left side (::) represent Indian states and their respective capital cities. Gujarat is related to its capital city, Gandhinagar. Similarly, Rajasthan is related to its capital city, Jaipur.

So, the missing word in the analogy is Jaipur.