create mentally vs plan

create mentally is not a noun while plan is a noun.

Word	Noun	Adjective	Verb	Adverb
create mentally	No	No	Yes	No
plan	Yes	No	Yes	No

As verbs, plan is a hyponym of create mentally; that is, plan is a word with a more specific, narrower meaning than create mentally:

create mentally: create mentally and abstractly rather than with one's hands
plan: make or work out a plan for; devise

create mentally (noun)	plan (noun)
	scale drawing of a structure
	a series of steps to be carried out or goals to be accomplished
	an arrangement scheme

create mentally (verb)	plan (verb)
create mentally and abstractly rather than with one's hands	make plans for something
	have the will and intention to carry out some action
	make or work out a plan for; devise