CAD vs software system

CAD and software system both are nouns.

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

As nouns, software system is a hypernym of CAD; that is, software system 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 system: (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 program.

CAD (noun)	software system (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