Docks and Sour grass

Sour grass and docks are semantically related. In some cases you can use "Sour grass" instead a noun "Docks".

Sour grass noun - Any of certain coarse weedy plants with long taproots, sometimes used as table greens or in folk medicine.

Docks and sour grass are semantically related. Sometimes you can replace term "Docks" with "Sour grass", this terms are similar.