The ur-forms of these words are different.

There are two forms of payment available.

The V-forms of the verb 'to be' are 'am', 'is', and 'are'.

Quadratic forms can be solved using various methods.

There are many different forms of government in the world.

The self-formed organization has been successful in achieving its goals.

The verb forms are important for understanding grammar.

The splice forms of the gene have different functions.

She back-formed the noun into a verb.

Differential forms are used in mathematical analysis and physics.