undertake vs lease

undertake is not a noun while lease is a noun.

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

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

Other hyponyms of undertake include stipulate, sign, condition, qualify, specify, stipulate, rent, charter, hire, rent.

undertake (noun)	lease (noun)
	a contract granting use or occupation of property during a specified time for a specified payment
	property that is leased or rented out or let
	the period of time during which a contract conveying property to a person is in effect

undertake (verb)	lease (verb)
promise to do or accomplish	engage for service under a term of contract
enter into a contractual arrangement	grant use or occupation of under a term of contract
enter upon an activity or enterprise	let for money
accept as a charge	hold under a lease or rental agreement; of goods and services
accept as a challenge