command vs open sesame

command and open sesame both are nouns.

Word	Noun	Adjective	Verb	Adverb
command	Yes	No	Yes	No
open sesame	Yes	No	No	No

As nouns, open sesame is a hyponym of command; that is, open sesame is a word with a more specific, narrower meaning than command:

Other hyponyms of command include countermand, order, charge, commission, direction, commandment, injunction, behest.

command (noun)	open sesame (noun)
the power or authority to command	any very successful means of achieving a result
availability for use	a magical command; used by Ali Baba
great skillfulness and knowledge of some subject or activity
an authoritative direction or instruction to do something
(computer science) a line of code written as part of a computer program
a military unit or region under the control of a single officer
a position of highest authority

command (verb)	open sesame (verb)
make someone do something
be in command of
demand as one's due
exercise authoritative control or power over
look down on