clasp vs seizing

clasp and seizing both are nouns.

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

As nouns, seizing is a hypernym of clasp; that is, seizing is a word with a broader meaning than clasp:

clasp: the act of grasping
seizing: the act of gripping something firmly with the hands (or the tentacles)

Other hypernyms of clasp include grasping, prehension, taking hold.

clasp (noun)	seizing (noun)
the act of grasping	the act of gripping something firmly with the hands (or the tentacles)
a fastener (as a buckle or hook) that is used to hold two things together	small stuff that is used for lashing two or more ropes together

clasp (verb)	seizing (verb)
hold firmly and tightly
grasp firmly
fasten with a buckle or buckles
fasten with or as if with a brooch