maintain vs have

maintain is not a noun while have is a noun.

Word	Noun	Adjective	Verb	Adverb
maintain	No	No	Yes	No
have	Yes	No	Yes	No

As verbs, have is a hypernym of maintain; that is, have is a word with a broader meaning than maintain:

Other hypernyms of maintain include have got, hold.

As verbs, have is a hypernym of maintain; that is, have is a word with a broader meaning than maintain:

Other hypernyms of maintain include have got, hold.

As verbs, have is a hypernym of maintain; that is, have is a word with a broader meaning than maintain:

Other hypernyms of maintain include have got, hold.

maintain (noun)	have (noun)
	a person who possesses great material wealth

maintain (verb)	have (verb)
stick to correctly or closely	cause to be born
state categorically	suffer from; be ill with
state or assert	undergo (as of injuries and illnesses)
support against an opponent	cause to move; cause to be in a certain position or condition
maintain by writing regular records	undergo
supply with necessities and support	cause to do; cause to act in a specified manner
keep in safety and protect from harm, decay, loss, or destruction	serve oneself to, or consume regularly
have and exercise	have sex with; archaic use
maintain for use and service	organize or be responsible for
cause to continue in a certain state, position, or activity	go through (mental or physical states or experiences)
	have or possess, either in a concrete or an abstract sense
	achieve a point or goal
	get something; come into possession of
	have ownership or possession of
	receive willingly something given or offered
	have a personal or business relationship with someone
	have as a feature
	be confronted with