nodules
"symbiotic"
Fixed nitrogen refers to nitrogen compounds that have been converted from atmospheric nitrogen by bacteria or through industrial processes, while free nitrogen refers to nitrogen gas (N2) that exists in the atmosphere in its elemental form. Fixed nitrogen is more readily available for use by plants and animals, while free nitrogen is inert and must be transformed into a usable form before it can be utilized.
Bumps
Clostridium Tetani
The red bumps on a turkey's head are called CARUNCLES.
They are called milk glands(bumps) prepares baby's milk
They are called manarilose
osteoderms
The bumps on our skin are called goose bumps as they resemble the bumpy skin of a goose after it has been plucked.
The "bumps" you refer to are called the "lobes". They are a precise size that allows the valves to open and close correctly in an engine.
The bumps on the moon are called lunar mountains or lunar highlands. These features are formed from impact events and volcanic activity on the moon's surface.