A Grunt

1. A short snorting sound, often to show disapproval, or used as a reply when one is reluctant to speak.
2. The snorting cry of a pig.
3. Any fish of the perciform family Haemulidae.
4. A person who does ordinary and boring work. Synonyms: gofer, lackey, peon
5. (US, military slang) An infantry soldier. Coordinate term: pogue
6. (slang) The amount of power of which a vehicle is capable.
7. (Canada, US) A dessert of steamed berries and dough, usually blueberries; blueberry grunt.Synonyms: fungy, fungee