command vs availability

command and availability both are nouns.

Word	Noun	Adjective	Verb	Adverb
command	Yes	No	Yes	No
availability	Yes	No	No	No

As nouns, availability is a hypernym of command; that is, availability is a word with a broader meaning than command:

Other hypernyms of command include accessibility, availableness, handiness.

command (noun)	availability (noun)
the power or authority to command	the quality of being at hand when needed
availability for use
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)	availability (verb)
make someone do something
be in command of
demand as one's due
exercise authoritative control or power over
look down on