Many politicians struggle with the challenges of fulfilling their dual mandates.

The duty cycles of the two machines are different.

The duck-bills waddled along the riverbank.

Duckbill cats are unique creatures with a distinctive bill shape.

The university offers a variety of due courses for students to choose from.

I packed all my clothes in duffle bags for the trip.

I found several dust-offs in the storage room.

I saw several feather duster worms while snorkeling.

I saw a group of duck ants marching in a straight line.

Heavy-duty vehicles are commonly used in construction sites.