5 letters · 8 points in Scrabble
originUnknown. Possibly from Richard Grice, the first champion trainspotterhttp://books.google.co.uk/books?id=rdU1xtIWJz0C&q=grice+trainspotter&dq=grice+trainspotter&hl=en&sa=X&ei=afhsT5ChFe-R0QWF8K3HBg&redir_esc=y. Alternatively perhaps a humorous representation of an upper-class pronunciation of grouser…
Etymology from Wiktionary, CC BY-SA 3.0