undertake vs charter

undertake is not a noun while charter is a noun.

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

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

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

undertake (noun)	charter (noun)
	a document incorporating an institution and specifying its rights; includes the articles of incorporation and the certificate of incorporation
	a contract to hire or lease transportation

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