emblem vs colophon

emblem and colophon both are nouns.

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

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

emblem: special design or visual object representing a quality, type, group, etc.
colophon: a publisher's emblem printed in a book (usually on the title page)

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

emblem (noun)	colophon (noun)
special design or visual object representing a quality, type, group, etc.	a publisher's emblem printed in a book (usually on the title page)
a visible symbol representing an abstract idea