Every day's a school day/word of the day

All my family have started playing scrabble again so I will have to get genned up!( Dunno whether genned is an allowed scrabble word though?) Words that are or are not allowed in scrabble seem to vary depending on which look up tool you use?

Or who you happen to be playing with my lad's a terror for blagging his way to allowing suspect words.  He sounds super confident, convinces everyone else it's valid, then when you check up on him it's a load of codswallop.