I tied a very tight knot.

I learned how to tie a slip knot to secure my backpack.

The lymph node filters body fluids and helps fight infections.

The Gordian knot has been an unsolvable problem for many.

I have a lump in my throat when I speak in public.

This plant has a knotty root.

The knotted tree stood majestic in the forest.

The branches of the trees are knotty.

The knotty roots extended beneath the surface of the ground.

The fragrant flowers perfume the room.