CAD vs software program

CAD and software program both are nouns.

Word	Noun	Adjective	Verb	Adverb
CAD	Yes	No	No	No
software program	Yes	No	No	No

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

CAD: software used in art and architecture and engineering and manufacturing to assist in precision drawing
software program: (computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory

Other hypernyms of CAD include computer software, package, software, software package, software system.

CAD (noun)	software program (noun)
software used in art and architecture and engineering and manufacturing to assist in precision drawing	(computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory