4 Pics 1 Word Level 666

Answer:
Mortar
Hint
What is the answer to the 4 Pics 1 Word level with A graduate cap with a diploma, A person holding up a grey substance , A black object on three legs on the grass, and A grey bowl with a big object in it?

Hint
What is the answer to the 4 Pics 1 Word level with A graduate cap with a diploma, A person holding up a grey substance , A black object on three legs on the grass, and A grey bowl with a big object in it?