spread eagle vs emblem

spread eagle and emblem both are nouns.

Word	Noun	Adjective	Verb	Adverb
spread eagle	Yes	No	No	No
emblem	Yes	No	No	No

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

spread eagle: an emblem (an eagle with wings and legs spread) on the obverse of the Great Seal of the United States
emblem: a visible symbol representing an abstract idea

Other hypernyms of spread eagle include allegory.

spread eagle (noun)	emblem (noun)
a skating figure executed with the skates heel to heel in a straight line	special design or visual object representing a quality, type, group, etc.
an emblem (an eagle with wings and legs spread) on the obverse of the Great Seal of the United States	a visible symbol representing an abstract idea