That's probably "mustard." The "p" is likely incorrect.
Chasten
Some seven letter words with N as the fifth letter areagainstbalancefriendspartnerqueenlyscienceseventy
Boastful
abilityboilingclinicsdairiesedificefailingglidinghailinginitialjoiningmailingnoisieropinionpricingquinineraisinssuicidetrivialutilityvoidingwriting
barrels
gradual
Tragedy
alludedamendedawarded
figures
No, one seventh is smaller than a fifth. It is divided seven times while a fifth is only divided five times.
Take issue
allocate, veracity, dovecote, haircuts, monocyte, velocity, allocute