Is rusting a onomatopoeia

Listen carefully to the sounds made by a pile of wet nails. This is the sound of rusting. It does not sound like the Word "rusting"- it is therefore not an example of onomatopoeia.

Listen to the sound of a pile of dry leaves being blown by the wind. This is the sound of rustling. It does sound like the Word "rustling" - it is therefore an example of onomatopoeia. Listen to the sound of a herd of cattle being stolen. This is also rustling. The sounds do not sound like the Word "rustling". In this case, the Word is not an example of onomatopoeia.