"grunt" in the noun sense
1. grunt, oink
the short low gruff noise of the kind made by hogs
an unskilled or low-ranking soldier or other worker
"infantrymen in Vietnam were called grunts"
"he went from grunt to chairman in six years"
medium-sized tropical marine food fishes that utter grunting sounds when caught
"grunt" in the verb sense
issue a grunting, low, animal-like noise
"He grunted his reluctant approval"
Source: WordNet® (An amazing lexical database of English)
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