course vs afters

course and afters both are nouns.

Word	Noun	Adjective	Verb	Adverb
course	Yes	No	Yes	Yes
afters	Yes	No	No	No

As nouns, afters is a hyponym of course; that is, afters is a word with a more specific, narrower meaning than course:

Other hyponyms of course include entree, main course, appetiser, appetizer, starter, dessert, sweet.

course (noun)	afters (noun)
a mode of action	a dish served as the last course of a meal
education imparted in a series of lessons or meetings
facility consisting of a circumscribed area of land or water laid out for a sport
(construction) a layer of masonry
part of a meal served at one time
a connected series of events or actions or developments
a body of students who are taught together
general line of orientation
a line or route along which something travels or moves

course (adverb)	afters (adverb)
as might be expected