How to copy word under caret to clipboard

A1: Install "Macros" plugin. In its dialog start recording a macro, and call these commands using "Command Palette":

• command "selection: select words at carets"
• command "clipboard: copy"
• command "selection: cancel selection"

Then assign a hotkey to this macro (in the "Command Palette", find your new macro and press F9).

A2: Plugin "CudaExt" has commands:

• plugin: CudaExt: Copy word or [expression] or 'expression' without selection
• plugin: CudaExt: Replace word or [expression] or 'expression' with clip

It's good to use these commands with hotkeys Alt+Left and Alt+Right (assign it in the "Command Palette").