tugboat

"The company used barges to transport tons of coal down the river. "

"She moved toward the door."

"The new school principal is a powerful advocate for student success. "

"Joint NATO maneuvers are as much an exercise in diplomacy as in tactics and logistics."

"Russia is a large country.   The fruit-fly has large eyes for its body size.   He has a large collection of stamps."

"supply and demand"

"The mother spoke to her child gently, trying to calm him down. "

"The family rented a small boat for a relaxing afternoon on the lake. "

"The child's small was sore after carrying his heavy backpack to school. "

"The barge carried a huge load of gravel to the construction site. "

"The harbor was full of vessels, from small fishing boats to large cargo ships. "

"When I give the signal, pull the rope."