malware vs ransomware

malware and ransomware both are nouns.

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

As nouns, ransomware is a hyponym of malware; that is, ransomware is a word with a more specific, narrower meaning than malware:

malware: malicious software, designed to break into a system
ransomware: malicious software that makes a computer unusable unless a payment is made to the attacker

malware (noun)	ransomware (noun)
malicious software, designed to break into a system	malicious software that makes a computer unusable unless a payment is made to the attacker