pontypool

I hear this like bud, weed cannabis and "solid"
From what i understand the whole plant is cannabis, so technically you don't buy cannabis.. then weed is the leaves and stuff right? whereas bud is the actual 'bud' of the cannabis like the fruit.. and its a lot more potent than the actual weed you can buy (also more expensive)
but someones been arguing with me saying weed is the real deal..
And I always thought solid was just weed or bud - not sure if it matters which# has been pressed somehow to make it into a brick like substance, not sure why. Oh and you also have the powder stuff.. i guess thats the bud grinded up into a powder using one of those grinders ive seen online.

So in terms of what I can buy, what would the street name be for all of the above things, how effective would each one be and roughly how much would each cost ?