A flat piece of wood is called a board.
plumage
Animals of the phylum Platyhelminthes are known as flatworms because their bodies are dorsoventrally flattened, giving them a thin and flat appearance. This flat body shape allows for efficient gas exchange and nutrient absorption through their body surface.
The soft greyish limestone that crumbles easily is called chalk.
A flat cut on a precious stone is called a "table cut". It is a cut where the top of the stone is polished flat with large facets.
Tam-O-shanter / bonnet
not sure!! sorry
could be a watch cap or a skullcap maybe even a slough hat
It is called Minky...There is a flat Minky and Minky with Bumpy Dots to be precise
Depending on how it is used it can be a hat or a top of a bottle, or a part on a car called a distributor cap. A lid or cover, or to place a limit on an activity, prices, or expenses. A cap gun toy for children.
The flat surface where spores are created is called the lamella. There are several different species of mushrooms.
Carbonated beverages will go flat overnight if uncovered. Bottles with a cap last longer, but will also loose some of their umf.
hard salary cap
Cap
A cap that got sat on is a flat hat
A flat cap is sometimes called a sixpence because it became popular among working-class men in the early 20th century who would commonly store a sixpence coin in the hat's lining for good luck. The term likely originated from this association with the coin.
Its called a Flat Cap, but looks way more awesome on Mario than an old man! haha