sanction vs OK

sanction and OK both are nouns.

Word	Noun	Adjective	Verb	Adverb
sanction	Yes	No	Yes	No
OK	Yes	No	No	Yes

As nouns, OK is a hyponym of sanction; that is, OK is a word with a more specific, narrower meaning than sanction:

Other hyponyms of sanction include O.K., okay, okeh, okey, visa, nihil obstat.

sanction (noun)	OK (noun)
the act of final authorization	an endorsement
a mechanism of social control for enforcing a society's standards	a state in south central United States
official permission or approval
formal and explicit approval

sanction (verb)	OK (verb)
give sanction to
give religious sanction to, such as through an oath
give authority or permission to

sanction (adverb)	OK (adverb)
	an expression of agreement normally occurring at the beginning of a sentence