Synonyms for diner

noun

1. One who eats

   patron, customer, luncher, guest, boarder, eater, diner-out, gourmet, gourmand, trencherman, snacker, grazer*, nosher*, chowhound*; see also glutton.

2. A restaurant, as on a train

   luncheonette, coffee shop, dining car, greasy spoon*; see dining room, restaurant.