take on vs take office

take on and take office both are verbs.

Word	Noun	Adjective	Verb	Adverb
take on	No	No	Yes	No
take office	No	No	Yes	No

As verbs, take office is a hypernym of take on; that is, take office is a word with a broader meaning than take on:

take on (verb)	take office (verb)
take on a certain form, attribute, or aspect	assume an office, duty, or title
contend against an opponent in a sport, game, or battle
admit into a group or community
accept as a challenge
take on titles, offices, duties, responsibilities