The word Menstrums is misspelled against Menstruums, which is plural of "Menstruum"
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Menstruums has double "uu" is mispronounced as "u"
Remember double 'UU' in between the strings menstr & ms which should not be misspelled with single 'U'
Wrong Spelling:  menstr-u-ms 
Correct Spelling:  menstr-uu-ms 
Check more misspelled words of Menstruums to spell it correct.