secureness vs fastness

secureness and fastness both are nouns.

Word	Noun	Adjective	Verb	Adverb
secureness	Yes	No	No	No
fastness	Yes	No	No	No

As nouns, secureness and fastness are synonyms defined as:

secureness and fastness: the quality of being fixed in place as by some firm attachment

Other synonyms of secureness include fixedness, fixity, fixture.

secureness (noun)	fastness (noun)
the quality of being fixed in place as by some firm attachment	a strongly fortified defensive structure
the state of freedom from fear or danger	a rate (usually rapid) at which something happens
	the quality of being fixed in place as by some firm attachment