demountable vs washable

demountable

adj
  • Able to be removed from its mount; designed to be dismantled. 

noun
  • A temporary and portable building, especially a portable classroom in a school. 

washable

adj
  • Capable of being washed without being damaged; especially by a specified method, for example machine-washable. 

noun
  • Something that can be washed without being damaged. 

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