Puzzle 3

The study of plants

A mass departure of people

Decayed, decomposed

Most recent

Remote-controlled aerial vehicles without pilots

Oppressive ruler, dictator

Expelled from one's native country

Challenges, missions

Canoe-like boats

Hunting dogs with expert sense of smell

Swapped, exchanged goods

Illness, sickness, disorder

Cleaner that removes dirt through suction

Makes broader

Sport on ice, with a puck and protective gear

Offer counsel to someone