For some reason, my mind went straight to shar- but would not move past shark, sharp and shart (all of which were impossible). I went through the whole alphabet and didn't see another word, went on to things like scarf, spark, scare, scary, smart (all of which can't be made). I guess I'm lucky I
didn't think of things like soars (like GB higher up). I eventually circled back and finally saw shard, but that fourth guess really took ridiculously long.