May the terms "soybean," "soy," and "soya" be considered synonyms for the term "soybeans" for the purpose of satisfying the FALCPA labeling requirements?
Yes. These are reasonable synonyms for the common or usual name "soybeans," and any of one
of these terms may be used to identify the food source of the major food allergen "soybeans."
Packaged foods that are made using soybeans as an ingredient or as a component of a multi-component ingredient (e.g., soy sauce or tofu) should continue to use the word "soybeans" as the appropriate common or usual name for this ingredient to identify properly the ingredient (e.g., "soy sauce (water, wheat, soybeans, salt)").
Source, http://www.cfsan.fda.gov/~dms/alrguid4.html, August 2007