7-letter words
cholent, cologne, ecology, enology, lengthy, neology, thegnly, theolog
8-letter words
cetology, cogently, ethology, gonocyte, theogony, theology
9-letter words
ethnology
10-letter words
technology
hallelujah? although, onomatopoeia sounds kinda onomatopoedic to me.
There is no single-word English anagram of aeeidmnrsttv - the longest word you can make from the letters is "avertiments".
deoxyribonucleic
FRaPPUNCINO
Stabile
HillBillies
Wipeout, seven characters WRONG the longest you can make is typewriter - 10 letters TYPEWRITER
Sadden, Weaned, Wended, Sweden,
You can use all seven letters to make the word catlike.
There is no word using all of the letters. The longest possible word is "BALANCE"
Assuming this is a riddle: personification.
I need help