inflammability vs flammability

inflammability and flammability both are nouns.

Word	Noun	Adjective	Verb	Adverb
inflammability	Yes	No	No	No
flammability	Yes	No	No	No

As nouns, inflammability and flammability are synonyms defined as:

inflammability and flammability: the quality of being easily ignited and burning rapidly

inflammability (noun)	flammability (noun)
the quality of being easily ignited and burning rapidly	the quality of being easily ignited and burning rapidly