keep vs maintenance

keep and maintenance both are nouns.

Word	Noun	Adjective	Verb	Adverb
keep	Yes	No	Yes	No
maintenance	Yes	No	No	No

As nouns, maintenance is a hyponym of keep; that is, maintenance is a word with a more specific, narrower meaning than keep:

Other hyponyms of keep include amenities, comforts, conveniences, creature comforts, meal ticket, subsistence.

keep (noun)	maintenance (noun)
the main tower within the walls of a medieval castle or fortress	activity involved in maintaining something in good working order
a cell in a jail or prison	the act of sustaining life by food or providing a means of subsistence
the financial means whereby one lives	the unauthorized interference in a legal action by a person having no interest in it (as by helping one party with money or otherwise to continue the action) so as to obstruct justice or promote unnecessary litigation or unsettle the peace of the community
	means of maintenance of a family or group
	court-ordered support paid by one spouse to another after they are separated

keep (verb)	maintenance (verb)
prevent (food) from rotting
prevent the action or expression of
stick to correctly or closely
maintain by writing regular records
supply with necessities and support
hold and prevent from leaving
retain possession of
look after; be the keeper of; have charge of
retain rights to
maintain for use and service
have as a supply
store or keep customarily
stop (someone or something) from doing something or being in a certain state
allow to remain in a place or position or maintain a property or feature
conform one's action or practice to
behave as expected during of holidays or rites
cause to continue in a certain state, position, or activity
supply with room and board
maintain in safety from injury, harm, or danger
fail to spoil or rot
continue a certain state, condition, or activity
to rear