metals
Some people maintain that "rhythms" qualifies. I don't.
therein
Inimical comes to mind, but I'm sure there are others. I can do you one letter better: a 7 letter word that contains three Is is "idiotic".
therein
The word Mollusk is a 7 letter word.
bombast
A 7-letter word that contains the letters C, A, S, and M is "scamper."
squeals
zygotes
success
therein
effaced, efforts, effects
algebraarrestsascendsbenefitboredombreederbreezescarefulcateredcheesescheereddeceivedefencedemeritdeservedetestsdevelopdigestsdinettediverseexpectsexpanseexpenseexpertsextendsforeignforestsforeverfriendsfreedomfreewaygreetedimpedesinheritintenseinventsinversemementomiserlyoffencepageboyparentspovertypreemptreceiverepentsreleaserepealsrevealsresealsreverseselectssleevessneezessomedaysteeplesteeredstretchtalentsthreads
bellhop
abdomen
Some people maintain that "rhythms" qualifies. I don't.
therein