What part of speech is no longer?

"No longer" is a phrase, not a single part of speech. It acts as an adverb modifying a verb, adjective, or another adverb.

Here's why:

* "No" is an adverb meaning "not at all".

* "Longer" is an adjective meaning "for a greater length of time" or an adverb meaning "for a greater period of time".

* Together, they combine to mean "not any longer" or "not for a greater period of time".

Examples:

* She no longer lives in the city. (modifying the verb "lives")

* I am no longer interested in that job. (modifying the adjective "interested")

* He waited no longer than five minutes. (modifying the adverb "longer")