increase vs change magnitude

increase is a noun but change magnitude is not a noun.

Word	Noun	Adjective	Verb	Adverb
increase	Yes	No	Yes	No
change magnitude	No	No	Yes	No

As verbs, change magnitude is a hypernym of increase; that is, change magnitude is a word with a broader meaning than increase:

increase (noun)	change magnitude (noun)
the act of increasing something
the amount by which something increases
a change resulting in an increase
a process of becoming larger or longer or more numerous or more important
a quantity that is added

increase (verb)	change magnitude (verb)
become bigger or greater in amount	change in size or magnitude
make bigger or more