afternoon vs midafternoon

afternoon and midafternoon both are nouns.

Word	Noun	Adjective	Verb	Adverb
afternoon	Yes	No	No	No
midafternoon	Yes	No	No	No

afternoon (noun)	midafternoon (noun)
a conventional expression of greeting or farewell, used to wish someone a good afternoon	the middle part of the afternoon
the part of the day between noon and evening