paywall vs mechanism

paywall and mechanism both are nouns.

Word	Noun	Adjective	Verb	Adverb
paywall	Yes	No	No	No
mechanism	Yes	No	No	No

As nouns, mechanism is a hypernym of paywall; that is, mechanism is a word with a broader meaning than paywall:

Other hypernyms of paywall include mechanics.

paywall (noun)	mechanism (noun)
A mechanism used to limit access to only paying users	the technical aspects of doing something
	device consisting of a piece of machinery; has moving parts that perform some function
	(philosophy) the philosophical theory that all phenomena can be explained in terms of physical or biological causes
	a natural object resembling a machine in structure or function
	the atomic process that occurs during a chemical reaction