assure vs undertake

assure and undertake both are verbs.

Word	Noun	Adjective	Verb	Adverb
assure	No	No	Yes	No
undertake	No	No	Yes	No

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

Other hyponyms of assure include pledge, plight, swear off, contract, guarantee.

assure (verb)	undertake (verb)
be careful or certain to do something; make certain of something	promise to do or accomplish
inform positively and with certainty and confidence	enter into a contractual arrangement
assure somebody of the truth of something with the intention of giving the listener confidence	enter upon an activity or enterprise
make a promise or commitment	accept as a charge
make certain of	accept as a challenge