Pensive-Byron lives on not only in his poetry, but also in his creation of the 'Byronic hero' - the persona of a pensive melancholy young man.
Solitude-The child was sent to his room, forced to go through the remainder of the day in solitude.Mound-They built small mounds to hide behind.

Commotion-They were amazed by the furious commotion they had caused.
Ventured-We ventured into the world of high-tech and bought a supercomputer.

Hope this helps:)
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