command line vs program line

command line and program line both are nouns.

Word	Noun	Adjective	Verb	Adverb
command line	Yes	No	No	No
program line	Yes	No	No	No

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

command line: commands that a user types in order to run an application
program line: (computer science) a line of code written as part of a computer program

Other hypernyms of command line include command, instruction, statement.

command line (noun)	program line (noun)
commands that a user types in order to run an application	(computer science) a line of code written as part of a computer program