Nutty notes usually come from sherry cask maturation. Especially Oloroso and Amontillado sherry casks can offer nut notes for the distillate after maturation. How you spot different nutty notes is always your personal experience. So if your mate can spot nut aromas or taste from a whisky but you can't, don't worry about it. What matters most is whether you like it or not. You can learn how to get the best out of each dram by practicing your tasting methods.
Few whiskies with nut notes:
- Kilchoman Loch Gorm has almond notes
- Bunnahabhain 12YO is very nutty
- Highland Park 10YO has some nut notes too
Below I've listed categories that usually have nutty whiskies in them: