Thoughtful? The only word that came to my mind.. I hope it works
tavern
The word is pleasant.
Tremendous.
talk
Tubby, which means fat
Test.
time off? time to spare?
tributary
trace
Trusts
i don't really know but the word starts with an a and the 5th,6th,and7th letters are m,a,t.
This is the answer: Kilowatt K-I-L-O-W-A-T-T. That is the eight letter word that starts with K and means 1,000 watts. Hope this answer helped! :)