Vain means to be conceited.
Example: He’s so vain he doesn’t know when he’s being insulted.
A vane is a blade that is moved by gas or liquid.
Example: a weather vane
A vein carries blood through the body or is a long slender deposit of a mineral.
Example: a vein of gold
Verbals are words that seem to mean an action or a state of being but do not function as verbs. They are sometimes called nonfinite verbs. Verbals are frequently used with other words in what is called a verbal phrase.
Example:Frequenting the shady bars in that neighborhood
[verbal phrase] is not a good idea.