emblem vs colours

emblem and colours both are nouns.

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

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

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

Other hyponyms of emblem include colophon, colors, crest, Cross, device, flag, heraldry, skull and crossbones, totem, totem pole.

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