Is later a preposition?

No, later is not a preposition.

“Later” functions as an adverb of time (e.g., “I will do it later”) and a comparative adjective (e.g., “Can we start the meeting a bit later tomorrow?”).

Be careful not to confuse later and latter. “Latter” means “toward the end” of a period or segment of something (e.g., “The product is in the latter stages of development) or refers back to the second/last thing in a list (e.g., “Of the two options, the latter makes much more sense”).

Use QuillBot’s free Grammar Checker to help you use commonly confused words such as “later” and “latter” correctly in your writing.