emblem vs dove

emblem and dove both are nouns.

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

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

emblem (noun)	dove (noun)
special design or visual object representing a quality, type, group, etc.	any of numerous small pigeons
a visible symbol representing an abstract idea	an emblem of peace
	flesh of a pigeon suitable for roasting or braising; flesh of a dove (young squab) may be broiled
	someone who prefers negotiations to armed conflict in the conduct of foreign relations