noun, noun, used as a suffix
Refers to a tool, implement, or apparatus, often in compound words. As a standalone noun, it is somewhat formal or technical.
この実験には精密な器が必要だ。
This experiment requires precise instruments.
「計器」の「器」は、測定する道具を表す。
The 器 in 計器 represents a measuring device.
noun, noun, used as a suffix
Refers to a container for holding things, such as a bowl, dish, or receptacle. Often used in compound words like 食器 (tableware) or 容器 (container).
この器に料理を盛り付けてください。
Please serve the food in this vessel.
陶器の器は温かみがある。
Ceramic vessels have a warm feel.
noun
Refers to a person's innate ability, talent, or capacity. Often used in expressions like 器が大きい (broad-minded, generous) or 器が小さい (petty, small-minded).
彼はリーダーとしての器がある。
He has the caliber to be a leader.
あの人は器が大きいから、細かいことは気にしない。
That person is broad-minded, so they don't sweat the small stuff.
道具 is a general word for tools or implements, while 器 as 'device' is more formal and often appears in compounds.
容器 is a common word for container; 器 as 'vessel' is more literary or used in specific compounds like 食器.
才能 is a general word for talent or ability; 器 refers more to one's innate capacity or character, often in a moral or leadership sense.
The kanji 器 originally depicted a container with a lid, representing a vessel or utensil. The extended meaning of 'ability' or 'capacity' comes from the idea of a vessel's capacity to hold things, metaphorically applied to a person's character or talent.