maintain vs pressurise

maintain and pressurise both are verbs.

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

As verbs, pressurise is a hyponym of maintain; that is, pressurise is a word with a more specific, narrower meaning than maintain:

maintain (verb)	pressurise (verb)
stick to correctly or closely	increase the pressure in or of
state categorically	maintain a certain pressure
state or assert	increase the pressure on a gas or liquid
support against an opponent
maintain by writing regular records
supply with necessities and support
keep in safety and protect from harm, decay, loss, or destruction
have and exercise
maintain for use and service
cause to continue in a certain state, position, or activity