The noun "lunch" is a common noun, a general word for a light meal usually eaten in the middle of the day; a word for any lunch of any kind.A proper noun is the name or title of a specific person, place, or thing; for example, the Lunch Box Deli in Norwood, MA or "The Little Book of Lunch" by Caroline Craig and Sophie Missing.The word "lunch" is also a verb: lunch, lunches, lunching, lunched.