The word Grubed is misspelled against Grubbed, which is past tense of "Grub"
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Grubbed has double "bb" is mispronounced as "b"
Remember double 'BB' in between the strings Gru & ed which should not be misspelled with single 'B'
Wrong Spelling:  Gru-b-ed 
Correct Spelling:  Gru-bb-ed 
Check more misspelled words of Grubbed to spell it correct.