colours vs emblem

colours and emblem both are nouns.

Word	Noun	Adjective	Verb	Adverb
colours	Yes	No	No	No
emblem	Yes	No	No	No

As nouns, emblem is a hypernym of colours; that is, emblem is a word with a broader meaning than colours:

colours: a distinguishing emblem
emblem: special design or visual object representing a quality, type, group, etc.

colours (noun)	emblem (noun)
a flag that shows its nationality	special design or visual object representing a quality, type, group, etc.
a distinguishing emblem	a visible symbol representing an abstract idea