機器・器機|ききkiki[1]atamadaka (head-high)

1. noundevice; equipment; machinery; apparatus
   ディスプレイはモニタともいい、コンピュータなどの機器ききから出力しゅつりょくされる静止画せいしがまたは動画どうがの映像えいぞう信号しんごうを表示ひょうじする機器ききである。↗

   A display, aka monitor, is an appliance that displays video signal of still images and moving pictures produced by a computer or similar device.

• Synonym装置そうちNeutralEquipment assembled or installed for a purpose; often forms compounds such as 「安全装置」「記憶装置」. 「機器」 is the blanket term for machines and instruments alike.
• Synonym設備せつびNeutralWhole facilities installed to meet a need, buildings and machinery included, as in 「設備投資」. 「機器」 points to the individual machines and instruments themselves.
• Synonym機械きかいNeutralA machine proper, built from mechanisms such as power and transmission. 「機器」 covers a wider range, taking in instruments and tools beyond machines.
• Related機材きざいNeutralWork machinery plus materials, as in 「撮影機材」. 「機器」 covers no materials — it means the machines and instruments themselves.
• Related装備そうびNeutralWeapons or gear equipped for a purpose, as in 「登山の装備」, with the stress on kitting oneself out fully. 「機器」 denotes the equipment itself.
• Related備品びひんNeutralItems kept at offices and schools — desks, chairs, gear — with the stress on ownership and management. 「機器」 centers on the machinery and instruments themselves.
• Related器具きぐNeutralImplements of simple construction, as in 「調理器具」. 「機器」 also takes in machinery of more complex build.
• RelatedツールNeutralLoanword for tools and means, often software tools. 「機器」 refers to physical machines and instruments.
• Related装具そうぐNeutralGear worn on the body — orthotic braces, combat gear, horse tack. Limited to things worn or carried; 「機器」 has no such restriction.
• Related道具どうぐNeutralA catch-all for tools and implements used to do things, also figuratively for means. 「機器」 centers on machinery-type equipment and leans toward written prose.
• RelatedイクイップメントNeutralLoanword for the gear needed for work or activity; confined to professional settings and rare. In everyday speech say 「機器」 or 「設備」.
• Related機具きぐWrittenMachines and tools, or machine-type tools, as in 「農機具」; a rare word with a written flavor. 「機器」 is the more common general term.
• Related用器ようきWrittenWritten and extremely rare: implements or instruments one uses, as in the technical term 「用器画」. In everyday speech say 「器具」 or 「機器」.

Use 「機器」 as the general term for machines and instruments, as in 「電子機器」. For a single machine say 「機械」, for an assembled device 「装置」, for whole facilities 「設備」, for simple implements 「器具」, for everyday tools 「道具」. 「装備」 is gear fitted out for a purpose and 「装具」 gear worn on the body; 「機材」 adds materials, as in 「撮影機材」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 機械きかい及および器具きぐ・道具どうぐ。