trumpeter vs bugler

trumpeter and bugler both are nouns.

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

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

trumpeter (noun)	bugler (noun)
large gregarious crane-like bird of the forests of South America having glossy black plumage and a loud prolonged cry; easily domesticated	someone who plays a bugle
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