involve vs necessitate

involve and necessitate both are verbs.

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

As verbs, involve and necessitate are synonyms defined as:

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

involve (verb)	necessitate (verb)
make complex or intricate or complicated	require as useful, just, or proper
occupy or engage the interest of	cause to be a concomitant
have as a necessary feature
connect closely and often incriminatingly
contain as a part
engage as a participant
require as useful, just, or proper