For each box, the given words can be divided into four groups of four words each, according to some criteria. The names of the resulting categories can in turn be used to find out a final two-word answer.
#1
acid alkaline bath brain
car eclipse hail hound
lithium money panel pressure
sand snow system wind
#2
boat cameral half holy
home hot lingual mineral
monthly oil pedal shelf
sea still way wild
This puzzle is part of Recycling old answers.