migrant vs roving

migrant

adj
  • Migratory. 

noun
  • A person who leaves one place in order to permanently settle in another. 

  • A migratory animal, in particular a migratory bird. 

  • Traveller or worker who moves from one region or country to another. 

  • Any of various pierid butterflies of the genus Catopsilia. Also called an emigrant. 

roving

adj
  • Moving about; having no fixed or permanent abode; travelling from place to place. 

  • Of the eyes or gaze, inspecting all over; not staying fixed on on subject. 

noun
  • A long and narrow bundle of fibre, usually used to spin woollen yarn or in felting. 

  • The process of giving the first twist to yarn. 

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