This is the 80th most frequent Thai word.
กอ
"กอ" means "clump" or "cluster."
In this sentence, 'กอ' refers to a clump or cluster, typically of trees or plants, indicating a groupality meaning.
กอไผ่นั้นสูงมาก
That bamboo clump is very tall.
Here, 'กอ' describes the characteristic of being a cluster or group of objects, emphasizing the collective nature.
เขายืนอยู่ใต้ต้นกอไผ่ใหญ่
He is standing under the big bamboo cluster.
In this case, 'กอ' signifies small units of grouped objects, suitable for describing grass or plants.