noun
ingredients; filling; things added to a dish
Common everyday use for solid items added to soup, rice balls, noodles, curry, and similar dishes; often translated as filling, topping, or ingredients depending on the food.
みそ汁の具は豆腐とわかめです。
The ingredients in the miso soup are tofu and wakame.
おにぎりの具は鮭が好きです。
I like salmon as the filling for rice balls.
noun
As a standalone noun this sense is limited in modern Japanese; it is much more often encountered as the 具 in compounds such as 道具, 雨具, 文房具, and 器具, referring to tools, gear, or implements.
登山には雨具を必ず持って行く。
You should always take rain gear when mountain climbing.
机の上に文房具が散らかっている。
Stationery is scattered across the desk.
counter
counter for sets of armor, utensils, furniture, etc.
Specialized counter for a complete set of items, especially in catalogues or formal descriptions of armor, utensils, furniture, and similar objects; uncommon in ordinary conversation.
目録には「甲冑一具」と記されている。
The catalogue lists it as one set of armor.
More explicit for food ingredients or materials used in cooking; 具 is shorter and often used for fillings or solid additions in a finished dish.
The ordinary standalone word for a tool or implement; 具 alone in the tool sense is limited and often appears inside compounds.
Means contents or what is inside in a broad sense; 具 specifically refers to edible fillings or ingredients in dishes.
Sino-Japanese reading ぐ of 具. The kanji is conventionally associated with implements, equipment, and things provided or contained; the food sense refers to the solid items put into a dish.