Ramble sorry I don't know anymore... Hope it helped.
Another word for talking quietly is whispering.
Another word for lot for hire can also mean lot for sale. Lot for hire can also mean a lot that needs repairs.
Discussing.
Another word for talking fast is yapping, I really dont even know if It`s a word but it's just what came into my head :L x
Another word for signs is probably going to be symbols but it depends on what you're talking about
Running at the mouth
mutter
talkative,or chatty
yakking
Speaker
Another word for material, if you are talking about food or liquid, would be ingredient. If you are talking about things that you will need to make or do something, then you can use the word supplies.
hazardous or vulgar when talking about jokes