放ほう火か犯はん人にん

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Meanings

1

noun

arsonist

A person who commits arson; used in legal and news contexts.

set free, release, fire

火fire

犯crime, sin, offense

人person

放ほう火か
放火 means 'arson' (the act), while 放火犯人 refers specifically to the person who commits it.
犯はん人にん
犯人 is a general term for 'criminal' or 'culprit'; 放火犯人 specifies the type of crime.

Compound of 放火 (ほうか, 'arson') and 犯人 (はんにん, 'criminal').