Agent
Igloo. Ogres. Agent. Agree. Again.
One synonym for negotiator is "agent" (less likely is "judge").
The letter "T" will make the word agent.
dye
spy
How about "agent"
Spy.
salt
Daily is a good word for a 5 letter word for everyday.
loose is a 5 letter word for not taut.
Inter is a 5-letter word for bury.
small 5 letter word