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The gardener billed his customers at the end of each month.
This means that the gardener sought payment for his services.
Or “bill” can mean “advertise or promote someone or something,” particularly on a sign or poster. For example, we could say:
The promoters billed the band as the festival’s top act.
Less commonly, you might see the word “billed” when reading about creatures that have a bill (i.e., a type of beak), such as a duck-billed platypus or a spoon-billed sandpiper. In this case, “billed” works as part of an adjective.
Summary: Build or Billed?
These words sound similar and both have common uses as a verb, but they have very different meanings in practice:
Build typically means “construct or develop something.”
Billed is usually a past-tense form of “bill,” meaning “prepare a bill” in order to seek payment for a product or service.
The key difference here is that “billed” is a variation of “bill.” It also follows the standard spelling convention for past tense verbs by ending in “-ed.”
Thus, if you’re looking for a word related to a bill – whether a bill for payment, a sign for an event, or a beak – you will want the spelling “billed.” But if you’re referring to constructing or developing something, the correct spelling will be “build.”