dichlorodifluoromethanes (24 letters)
deliteful
Some five letter words that start with D are:dailydairydaisydandydeathdebutdecordeferdemurdepthdiaryDreamdummydutch
The longest is a four-letter word: dean
democracy
Dashing.
The longest word in English that can be spelled with the eleven letters DAIRBUNSPTH is the ten letter word PAINTBRUSH.
Any fifteen (15) letter word, for example: the word, senti/mental/ize/d, the initial word is mental.
14-letter wordsbourgeoisified, bureaucratised, bureaucratized, butterfingered
There are a few 19 letter words that start with the letter s. However, there are no 19 letter words that start with s and end with d.
Hundreds, if not thousands.
tuckeredtailoredtemperedtraveledthwartedticketedtamperedthreaded