trombone vs sackbut

trombone and sackbut both are nouns.

Word	Noun	Adjective	Verb	Adverb
trombone	Yes	No	No	No
sackbut	Yes	No	No	No

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

trombone: a brass instrument consisting of a long tube whose length can be varied by a U-shaped slide
sackbut: a medieval musical instrument resembling a trombone

trombone (noun)	sackbut (noun)
a brass instrument consisting of a long tube whose length can be varied by a U-shaped slide	a medieval musical instrument resembling a trombone