large tree; big tree; huge tree
Refers to a physically large tree, often with a sense of grandeur or age. Common in descriptive and literary writing.
A large tree stands in the center of the park.
The travelers rested in the shade of the large tree.
その大樹は樹齢数百年と言われている。
That huge tree is said to be several hundred years old.
The small sapling eventually grew into a large tree.
The large tree in the garden fell down because of the typhoon.
高木 focuses specifically on a tree's height, whereas 大樹 covers overall largeness, not just tallness.
Compound of 大 (large) and 樹 (tree). The reading たいじゅ is the on'yomi for both characters.