Here are the 5-letter words ending in “ur” in standard English (based on major dictionaries like Merriam-Webster, Scrabble/Word Finder lists, and common word games like Wordle/Words With Friends). The most widely accepted and common ones include:
- amour (love affair, especially romantic)
- augur (to predict or foretell; also a soothsayer)
- demur (to object or hesitate)
- femur (thigh bone)
- flour (ground wheat or other grain)
- incur (to become subject to something unwelcome, like costs or debt)
- lemur (a primate native to Madagascar)
- occur (to happen or take place)
- recur (to happen again)
- scour (to clean by rubbing hard, or to search thoroughly)
Other valid or Scrabble-accepted ones (including some less common, dialectal, or variant spellings)
- colour (a bump or bruise, chiefly Scottish)
- debur (to remove burrs, variant of deburr)
- knaur (a knot in wood, variant of knar)
- mohur (an old gold coin from India)
- odour (British spelling of odor; smell)
- scaur (a variant of scar, meaning a cliff or bare rocky place, chiefly Scottish)
- shiur (a lesson or portion in Jewish study, from Hebrew)
- sieur (an old term for sir or mister, archaic/French-influenced)
- stour (battle or conflict, archaic or dialectal)
Rarer or more obscure ones are sometimes listed
- fleur (flower, French borrowing)
- gebur (variant or rare)
- regur (rich black soil in India)
- whaur (Scottish for “where”)
There are roughly 20–30, depending on the dictionary or game rules (e.g., Scrabble TWL/OWL allows most of the above, but some like “whaur” or “shiur” may be restricted in certain formats). The top 10 most common everyday ones are the first list I gave.