lodgment vs fastness

lodgment and fastness both are nouns.

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

As nouns, fastness is a hypernym of lodgment; that is, fastness is a word with a broader meaning than lodgment:

Other hypernyms of lodgment include fixedness, fixity, fixture, secureness, allegation.

lodgment (noun)	fastness (noun)
the state or quality of being lodged or fixed even temporarily	a strongly fortified defensive structure
	a rate (usually rapid) at which something happens
	the quality of being fixed in place as by some firm attachment