冒ぼう険けん小しょう説せつ

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Meanings

1

noun

adventure novel; adventure story

Refers to a genre of fiction centered on exciting journeys, exploration, or daring exploits.

risk, face, defy

険precipitous, inaccessible place, impregnable position

小little, small

説opinion, theory, explanation

冒ぼう険けん
冒険 is the general noun for 'adventure', while 冒険小説 specifically means 'adventure novel'.
小しょう説せつ
小説 is the general term for 'novel' or 'fiction', while 冒険小説 specifies the adventure genre.

Compound of 冒険 (adventure) + 小説 (novel).