clasp vs fasten

clasp is a noun but fasten is not a noun.

Word	Noun	Adjective	Verb	Adverb
clasp	Yes	No	Yes	No
fasten	No	No	Yes	No

As verbs, fasten is a hypernym of clasp; that is, fasten is a word with a broader meaning than clasp:

Other hypernyms of clasp include fix, secure.

As verbs, fasten is a hypernym of clasp; that is, fasten is a word with a broader meaning than clasp:

Other hypernyms of clasp include fix, secure.

clasp (noun)	fasten (noun)
the act of grasping
a fastener (as a buckle or hook) that is used to hold two things together

clasp (verb)	fasten (verb)
hold firmly and tightly	make tight or tighter
grasp firmly	become fixed or fastened
fasten with a buckle or buckles	cause to be firmly attached
fasten with or as if with a brooch	attach to