Select the related word from given alternatives:River:Tributary::Tree:?RootFlowerBranchStem

To solve the analogy "River:Tributary::Tree:?", we need to identify the relationship between the first pair of words and apply the same relationship to the second pair.

1. ### Break Down the Problem

• Identify the relationship in the first pair (River:Tributary). A tributary is a smaller river that flows into a larger river.

• Apply the same relationship to the second pair (Tree:?). A part of a tree will related to the whole tree in a similar manner.

2. ### Relevant Concepts

• A tributary is a part of a river, just as we need to find a part of a tree.

3. ### Analyze Options

• Root: A part of the tree, it anchors the tree.
• Flower: A reproductive part of some trees (not all).
• Branch: A part of the tree that grows out from the trunk.
• Stem: This typically refers to the main structural part of a plant, which is not specific to trees.

4. ### Verify and Summarize

Among the options, Branch is the best analogy, as just like a tributary is a smaller part flowing into a river, a branch is a smaller part of the tree.

Final Answer

Branch