maintain vs uphold

maintain and uphold both are verbs.

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

As verbs, maintain and uphold are synonyms defined as:

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

maintain (verb)	uphold (verb)
stick to correctly or closely	stand up for; stick up for; of causes, principles, or ideals
state categorically	support against an opponent
state or assert	keep or maintain in unaltered condition; cause to remain or last
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