The letters 'ustoodwernj' = justone word.
Fossil
The two longest available words are:earthyhearty
There are 4 distinguishable letters in the word fish, so there is 4! or 24 different ways can you arrange the letters in the word fish.
The only words you can make with these letters are: ESTERIFY OUTFIRES REEFIEST
Tubelight
There is no single English word that meets the criteria.
relieved
The six letters in "ice" and "out" can't be rearranged to spell one word, but the nine letters in "ice and out" can be rearranged to spell "education", "cautioned" or "auctioned".
Those letters will spell ceiling fan.
Batteries
oranges