trojan vs malevolent program

trojan and malevolent program both are nouns.

Word	Noun	Adjective	Verb	Adverb
trojan	Yes	No	No	No
malevolent program	Yes	No	No	No

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

trojan: a program that appears desirable but actually contains something harmful
malevolent program: a computer program designed to have undesirable or harmful effects

trojan (noun)	malevolent program (noun)
a program that appears desirable but actually contains something harmful	a computer program designed to have undesirable or harmful effects