Is grains or seeds a common or proper noun?

Answer 1

The noun 'grains' is a common noun, a general word for 'types of' or 'kinds of' cultivated cereal used as food; a general word for small hard particles of a substance such as salt or sand; a word for any grains of any kind.

The noun 'seeds' is a common noun, a general word for units of reproduction of flowering plants, capable of developing into another such plant; a word for any seeds of any kind.

A proper noun is the name or title of a specific person, place, or thing; for example, the US Grains Council (a non-profit) in Washington, DC or Seeds Avenue in Sarasota, FL.

The word 'seeds' is also the third person, singular, present of the verb to seed.