Use Context Menu: Highlight the word, right-click and select Search Web for “…” — JDB Use Quicksearch: Use Alt-D to go to Address Bar, type “google keyword” and press enter. Go to Bookmarks -> Manage Bookmarks -> Quick Searches for customizing your quick searches. — MariusZ Use Shortcut to go to Search Box: Press Ctrl-K to go to search box, and press ctrl-Up/Down to switch search options. — MicrowaveSafe Hyperwords Extension: Get the extension, highlight a word and press Alt-LeftClick to bring up the search options. — BruceMagnus DragdeGo Extension: Get DragdeGo, configure it with your own preference, highlight a word, and drag to different directions from the word to search different search engines. — PCL

Thanks for the contributions, lifehack.org readers! Those are great alternatives!