command key vs control key

command key and control key both are nouns.

Word	Noun	Adjective	Verb	Adverb
command key	Yes	No	No	No
control key	Yes	No	No	No

As nouns, command key and control key are synonyms defined as:

command key and control key: (computer science) the key on a computer keyboard that is used (in combination with some other key) to type control characters

command key (noun)	control key (noun)
(computer science) the key on a computer keyboard that is used (in combination with some other key) to type control characters	(computer science) the key on a computer keyboard that is used (in combination with some other key) to type control characters