Is a Nick and Nora glass the same as a coupe?

Similar but not identical. Both are stemmed, both serve cocktails up. The Nick and Nora is bell-shaped (curves inward at the top); the coupe is saucer-shaped (open top). The Nick and Nora holds aromatics better; the coupe is more dramatic.

Both glasses serve the same function — cocktails up, no ice — but the shapes diverge in subtle ways that matter: (1) The coupe has a wide, open mouth and a shallow saucer-shaped bowl. Holds 5 to 7 oz. Aromatics dissipate quickly. (2) The Nick and Nora has a narrower, slightly tapered mouth (curving inward like a tulip or a champagne flute that ends early). Holds 5 to 6 oz. Aromatics concentrate at the surface, so each sip carries more nose. The Nick and Nora is named after Nick and Nora Charles, the cocktail-drinking couple from the 1930s Thin Man films, where the bell-shaped glass is visible in the actors' hands. Modern craft bars often default to Nick and Nora for spirit-forward classics (Manhattan, Vieux Carré, Sazerac) where the concentrated aromatics matter, and to coupe for citrus-and-bubbly cocktails (Daiquiri, French 75, Aviation) where the wider mouth shows off the foam and color. Both are correct; both are interchangeable for any recipe. The choice is aesthetic.