malware vs software

malware and software both are nouns.

Word	Noun	Adjective	Verb	Adverb
malware	Yes	No	No	No
software	Yes	No	No	No

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

malware: malicious software, designed to break into a system
software: (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 malware include computer software, package, software package, software program, software system.

malware (noun)	software (noun)
malicious software, designed to break into a 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