Soybean
Part of speech: noun
Definition: A legume plant (scientific name Glycine max), commonly cultivated for human and animal consumption and as a nitrogen-fixing ground cover. The edible seed of this plant.
Soy
Part of speech: noun
Definition: A Chinese and Japanese liquid sauce for fish, made by subjecting boiled beans to long fermentation and then long digestion in salt and water. US preference is the term soy sauce.Soybeans. Often used attributively.
Example sentence: Don't dunk your nigiri in the soy sauce. Don't mix your wasabi in the soy sauce. If the rice is good, complement your sushi chef on the rice.