faults
netts
Ts
Hairts (like HAIR, but with ts on the end - the ts sound as in CATS)
carrots
the end = koniec (ko nie ts)
tattle
Gibberish.
Ts
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern -AU----TS. That is, nine letter words with 2nd letter A and 3rd letter U and 8th letter T and 9th letter S. In alphabetical order, they are: gauntlets nauseants saucepots
Ants
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 5 words with the pattern --AU-TS. That is, seven letter words with 3rd letter A and 4th letter U and 6th letter T and 7th letter S. In alphabetical order, they are: avaunts chaunts draunts fiaunts flaunts
An eight-letter word cannot be made from four letters. T, I, E and S are not sufficient to make an eight-letter word without knowing what letters can be repeated and how often they are repeated. TESTIEST could work if you allow three Ts.