chock vs sustain

chock is a noun but sustain is not a noun.

Word	Noun	Adjective	Verb	Adverb
chock	Yes	No	Yes	Yes
sustain	No	No	Yes	No

As verbs, sustain is a hypernym of chock; that is, sustain is a word with a broader meaning than chock:

Other hypernyms of chock include hold, hold up, support.

chock (noun)	sustain (noun)
a block of wood used to prevent the sliding or rolling of a heavy object

chock (verb)	sustain (verb)
support on chocks	undergo (as of injuries and illnesses)
secure with chocks	establish or strengthen as with new evidence or facts
	admit as valid
	supply with necessities and support
	provide with nourishment
	be the physical support of; carry the weight of
	lengthen or extend in duration or space

chock (adverb)	sustain (adverb)
as completely as possible