Herbs mixed and put together in a muslin bag are called 'Bouquet Garni'.
In the UK we would look at it the other way round and ask 'Why is a nappy called a diaper in some parts of the world?'. Nappy is short for napkin. daiper is the type of weave used in the cloth. In the many centuries before toilet paper a daipered cloth was used for that function (in the higher classes). (The type of cloth that some in the UK [i believe] call muslin)
Cloth made from wool is called wool cloth.
Maror (מרור)
In Kannada, we would call Batte.
Component of the mixture
A rag.
Fabic
A mixture of metals is called an alloy.
"Jadi Booti"
A person who sells herbs to be used as medicine is typically called an herbalist or a herbal practitioner.
A small piece of cloth is usually called a patch. A small piece of cloth could also be called a rag or a washcloth.
Draper