While he only shares the screen with Thor, Rocket and Groot, he is several times larger than Thor, and would likely be physically taller than both Hulk and Thanos.
For the first time, Peter Dinklage gets to be the biggest guy in a movie.
Traditionally, Eitri is portrayed in the comics as a more or less traditional fantasy style dwarf, shorter, if broader, than your average human.
What makes the role almost humorous is that Eitri, is huge.