Can you have synonyms for a word that is in another group?

Great grid really enjoyed it thanks

Nice grid, original ideas, not too easy, not too difficult, but didn't recognise some of my descriptions. So I got all the groups but not the full points. In fairness, for the bushel group, I just put 'hay' as I couldn't think how else!

@Richard, that's almost a rule here.
@Toferino, yeah, I couldn't find a good way to describe it either, tried cereal crop harvest measure, didn't work. Fact is that they're not actually synonyms, just variations on a theme. But I gave myself the points anyway.