• fold rush state,
• vold rush state,
• bold rush state,
• hold rush state,
• yold rush state,
• told rush state,
• gild rush state,
• gkld rush state,
• glld rush state,
• gpld rush state,
• g0ld rush state,
• g9ld rush state,
• gokd rush state,
• gopd rush state,
• good rush state,
• gols rush state,
• golx rush state,
• golc rush state,
• golf rush state,
• golr rush state

The adjective form of the phrase "Gold Rush State" is "Gold Rush State". Adjectives typically do not change form based on whether they modify a noun or stand alone.