Small hand-held fragmentation, smoke-producing, concussion, and illuminating devices are best known as?

The classification of small hand-held fragmentation, smoke-producing, concussion, and illuminating devices as grenades is accurate because grenades are specifically designed to be thrown or launched and are used in various military applications.

Fragmentation grenades are intended to disperse shrapnel upon detonation, causing damage to personnel and equipment within the vicinity. Smoke-producing grenades are used for creating visual obstructions or signaling, while concussion grenades focus on producing a powerful shockwave to incapacitate or disorient targets. Additionally, there are illuminating grenades that serve to light up an area, enhancing visibility during nighttime operations.

While explosives encompass a broader category that includes all matter related to explosive materials, the term does not specifically denote the hand-held nature of the devices listed. Fireworks are primarily designed for entertainment and aesthetic display, lacking the military applications of grenades. Flares, on the other hand, are specifically designed for signaling, illumination, or marking targets rather than the multi-faceted combat purposes served by grenades.

Thus, grenades accurately encompass the functions and types of devices mentioned in the question.