donkey vs emblem

donkey and emblem both are nouns.

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

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

donkey: the symbol of the Democratic Party; introduced in cartoons by Thomas Nast in 1874
emblem: a visible symbol representing an abstract idea

Other hypernyms of donkey include allegory.

donkey (noun)	emblem (noun)
domestic beast of burden descended from the African wild ass; patient but stubborn	special design or visual object representing a quality, type, group, etc.
the symbol of the Democratic Party; introduced in cartoons by Thomas Nast in 1874	a visible symbol representing an abstract idea