undertake vs attempt

undertake is not a noun while attempt is a noun.

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

As verbs, undertake and attempt are synonyms defined as:

Other synonyms of undertake include set about.

undertake (noun)	attempt (noun)
	earnest and conscientious activity intended to do or accomplish something
	the act of attacking

undertake (verb)	attempt (verb)
promise to do or accomplish	enter upon an activity or enterprise
enter into a contractual arrangement	make an effort or attempt
enter upon an activity or enterprise
accept as a charge
accept as a challenge