self-command vs will power

self-command and will power both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-command	Yes	No	No	No
will power	Yes	No	No	No

As nouns, self-command and will power are synonyms defined as:

self-command and will power: the trait of resolutely controlling your own behavior

Other synonyms of self-command include possession, self-control, self-possession, self-will, willpower.

self-command (noun)	will power (noun)
the trait of resolutely controlling your own behavior	the trait of resolutely controlling your own behavior