ascertain vs card

ascertain is not a noun while card is a noun.

Word	Noun	Adjective	Verb	Adverb
ascertain	No	No	Yes	No
card	Yes	No	Yes	No

As verbs, card is a hyponym of ascertain; that is, card is a word with a more specific, narrower meaning than ascertain:

ascertain: be careful or certain to do something; make certain of something
card: ask someone for identification to determine whether he or she is old enough to consume liquor

Other hyponyms of ascertain include proof, proofread, control, double-check, cross-check, cinch, spot-check, cover.

ascertain (noun)	card (noun)
	one of a set of small pieces of stiff paper marked in various ways and used for playing games or for telling fortunes
	a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities
	a rectangular piece of stiff paper used to send messages (may have printed greetings or pictures)
	a card certifying the identity of the bearer
	a sign posted in a public place as an advertisement
	(baseball) a list of batters in the order in which they will bat
	a printed or written greeting that is left to indicate that you have visited
	a list of dishes available at a restaurant
	(golf) a record of scores (as in golf)
	a witty amusing person who makes jokes
	thin cardboard, usually rectangular

ascertain (verb)	card (verb)
be careful or certain to do something; make certain of something	ask someone for identification to determine whether he or she is old enough to consume liquor
learn or discover with certainty	separate the fibers of
find out, learn, or determine with certainty, usually by making an inquiry or other effort
establish after a calculation, investigation, experiment, survey, or study