attempt vs undertake

attempt is a noun but undertake is not a noun.

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

As verbs, attempt and undertake are synonyms defined as:

Other synonyms of attempt include set about.

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

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