麦 is the umbrella term for wheat, barley, rye, and oats; English has no single everyday word for this group. Use 小麦 or 大麦 when the kind matters.
Types
- 小麦: wheat (bread, noodles, flour)
- 大麦: barley (tea, beer, 麦ご飯)
- ライ麦: rye
- オーツ麦 / 燕麦: oats
Compounds
- 麦茶: roasted barley tea, the standard cold drink of a Japanese summer
- 麦ご飯: rice cooked with barley
- 麦わら帽子: straw hat
- 麦畑: wheat or barley field