necessitate vs ask

necessitate and ask both are verbs.

Word	Noun	Adjective	Verb	Adverb
necessitate	No	No	Yes	No
ask	No	No	Yes	No

As verbs, necessitate and ask are synonyms defined as:

Other synonyms of necessitate include call for, demand, involve, need, postulate, require, take.

necessitate (verb)	ask (verb)
require as useful, just, or proper	make a request or demand for something to somebody
cause to be a concomitant	direct or put; seek an answer to
	address a question to and expect an answer from
	consider obligatory; request and expect
	require or ask for as a price or condition
	make a date
	require as useful, just, or proper