Below the main level, we have a large playroom. What part of speech is below?

Preposition.

Thank you Bobpursley from Caitlin

To determine the part of speech of a word, you can refer to its function within a sentence. In this case, the word "below" functions as a preposition.

A preposition is a word that typically indicates location, direction, time, or manner. It is used to show the relationship between a noun or a pronoun and another word in the sentence. In the given sentence, "below" is indicating the location of the playroom in relation to the main level.

You can identify a preposition by observing how it connects other words or phrases in a sentence. In this case, "below" connects "the main level" and "a large playroom." Other examples of prepositions include "in," "on," "over," "under," "through," "with," and many others.

Remember that the part of speech of a word can vary depending on its usage in different sentences.