Is the word 'noisy' onomatopoeic

Answer 1

Not really; especially when used by itself. The word "noisy" has the sonorant n and z sounds in it, and two eesounds. The word brings to mind the sound of murmuring more than actual loud noise. However, murmuring is also noise -- so from that standpoint, it could be considered mildly onomatopoeic. Onomatopoeia is more effective in phrases or longer passages of text. "Noisy bees," for example, has two z sounds in it, which helps one to imagine the buzzing of bees. "Noisy bees, zipping from rose to rose" is even more effective, as it has five z sounds in it.

Answer 2

Yes, "noisy" is onomatopoeic as it phonetically imitates the sounds associated with noise, such as clatter or disturbance.