earthbound vs earthwards

earthbound

adj

  • Heading towards Earth. 

  • Unimaginative or mundane. 

  • Confined to the Earth; unable to leave Earth, either physically or spiritually. 

earthwards

adj

  • Towards the earth; earthward. 

adv

  • Towards the earth; earthward. 

How often have the words earthbound and earthwards occurred in a corpus of books? (source: Google Ngram Viewer )