minor role vs soubrette

minor role and soubrette both are nouns.

Word	Noun	Adjective	Verb	Adverb
minor role	Yes	No	No	No
soubrette	Yes	No	No	No

As nouns, soubrette is a hyponym of minor role; that is, soubrette is a word with a more specific, narrower meaning than minor role:

minor role: a small role
soubrette: a minor female role as a pert flirtatious lady's maid in a comedy

minor role (noun)	soubrette (noun)
a small role	a minor female role as a pert flirtatious lady's maid in a comedy
	a pert or flirtatious young girl