demand vs require

demand is a noun but require is not a noun.

Word	Noun	Adjective	Verb	Adverb
demand	Yes	No	Yes	No
require	No	No	Yes	No

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

Other hyponyms of demand include want, ask, expect, clamor, clamour, dun, ask.

As verbs, demand and require are synonyms defined as:

Other synonyms of demand include ask, call for, involve, necessitate, need, postulate, take.

demand (noun)	require (noun)
the act of demanding
required activity
an urgent or peremptory request
the ability and desire to purchase goods and services
a condition requiring relief

demand (verb)	require (verb)
request urgently and forcefully	make someone do something
claim as due or just	consider obligatory; request and expect
summon to court	have need of
ask to be informed of	require as useful, just, or proper
lay legal claim to
require as useful, just, or proper