admeasure vs ascertain

admeasure and ascertain both are verbs.

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

As verbs, ascertain is a hypernym of admeasure; that is, ascertain is a word with a broader meaning than admeasure:

admeasure: determine the quantity of someone's share
ascertain: establish after a calculation, investigation, experiment, survey, or study

Other hypernyms of admeasure include determine, find, find out.

admeasure (verb)	ascertain (verb)
determine the quantity of someone's share	be careful or certain to do something; make certain of something
	learn or discover with certainty
	find out, learn, or determine with certainty, usually by making an inquiry or other effort
	establish after a calculation, investigation, experiment, survey, or study