The stalk is the part of the plant to which the flower and leaves are attached; the long thin part that comes out of the ground (the main stem.)
Bouquet and bunch are much closer in meaning. Sometimes they can mean the same; but bouquet is more limited in meaning. It is actually a French word (pronounced boo-KAY) and like many French words used in English, it has more elegant, "special" associations than its English equivalent, "bunch." The word bouquet would suggest a more carefully prepared, perhaps more expensive bunch of flowers.
Bunch can also apply to other things: you can have a bunch of sticks, bananas and anything that can be grouped together in a flower-like way; whereas you can't have a bouquet of bananas etc.
By the way, bouquet does have another meaning. If you talk about the bouquet of a glass of wine, you mean the smell.
Bouquet and bunch are much closer in meaning. Sometimes they can mean the same; but bouquet is more limited in meaning. It is actually a French word (pronounced boo-KAY) and like many French words used in English, it has more elegant, "special" associations than its English equivalent, "bunch." The word bouquet would suggest a more carefully prepared, perhaps more expensive bunch of flowers.
Bunch can also apply to other things: you can have a bunch of sticks, bananas and anything that can be grouped together in a flower-like way; whereas you can't have a bouquet of bananas etc.
By the way, bouquet does have another meaning. If you talk about the bouquet of a glass of wine, you mean the smell.