This is the 17006th most frequent Russian word.
соя
Soy.
In this sentence, "соя" refers to soybeans as a leguminous crop or product.
В магазин привезли свежую сою.
Fresh soy was brought to the store.
Here, "соя" in its adjectival form "соевый" refers to products derived from soy, specifically soy milk.
Многие люди заменяют обычное молоко соевым.
Many people replace regular milk with soy milk.
In this context, "соя" is used to indicate the general use of soy products in culinary contexts.