bombing vs bombardment

bombing and bombardment both are nouns.

Word	Noun	Adjective	Verb	Adverb
bombing	Yes	No	No	No
bombardment	Yes	No	No	No

As nouns, bombing and bombardment are synonyms defined as:

bombing (noun)	bombardment (noun)
an attack by dropping bombs	the heavy fire of artillery to saturate an area rather than hit a specific target
the use of bombs for sabotage; a tactic frequently used by terrorists	an attack by dropping bombs
	the act (or an instance) of subjecting a body or substance to the impact of high-energy particles (as electrons or alpha rays)
	the rapid and continuous delivery of linguistic communication (spoken or written)