Another word could be shy, quiet, close-mouthed, and mute.
quite
quiet, Mute, silent, hushed.
silent OR (with another meaning) dumb.
yakking
to be "sly" or "slveyne"
Another word for the word speak would be to talk. Or you could say verbalize or communicate would also work.
talking points
Spoke. Discussed. Conversed. Communicated.
yakking
talkative,or chatty
Another word for talking quietly is whispering.
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.
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
Speaker
mutter
hazardous or vulgar when talking about jokes
to be "sly" or "slveyne"
converse.