aggressiveness vs belligerence

aggressiveness and belligerence both are nouns.

Word	Noun	Adjective	Verb	Adverb
aggressiveness	Yes	No	No	No
belligerence	Yes	No	No	No

As nouns, aggressiveness and belligerence are synonyms defined as:

Other synonyms of aggressiveness include pugnacity.

aggressiveness (noun)	belligerence (noun)
the quality of being bold and enterprising	a natural disposition to be hostile
a natural disposition to be hostile	hostile or warlike attitude or nature
a feeling of hostility that arouses thoughts of attack