entail vs necessitate

entail is a noun but necessitate is not a noun.

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

As verbs, necessitate is a hypernym of entail; that is, necessitate is a word with a broader meaning than entail:

entail (noun)	necessitate (noun)
the act of entailing property; the creation of a fee tail from a fee simple
land received by fee tail

entail (verb)	necessitate (verb)
limit the inheritance of property to a specific class of heirs	require as useful, just, or proper
impose, involve, or imply as a necessary accompaniment or result	cause to be a concomitant
have as a logical consequence