courier vs trumpeter

courier and trumpeter both are nouns.

Word	Noun	Adjective	Verb	Adverb
courier	Yes	No	No	No
trumpeter	Yes	No	No	No

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

courier (noun)	trumpeter (noun)
a person who carries a message	large gregarious crane-like bird of the forests of South America having glossy black plumage and a loud prolonged cry; easily domesticated
	large pure white wild swan of western North America having a sonorous cry
	a musician who plays the trumpet or cornet
	(formal) a person who announces important news