Synonyms for Wanderer (same or very similar meaning)
WordNet sense 1 (someone who leads a wandering unsettled life):
roamer, rover, bird of passageWordNet sense 2 (a computer program that prowls the internet looking for publicly accessible resources that can be added to a database; the database can then be searched with a search engine):
spiderFrom the ODE community, based on WordNetadd/edit