Common words:
* Colour (British English spelling)
* Favor (American English spelling)
* Flavor
* Horror
* Humor
* Labor
* Neighbor
* Odor
* Rumor
* Valor
Less common words:
* Amour (love, French origin)
* Arbor (a shady place with trees)
* Clamor (loud noise)
* Decour (a style of ornamentation)
* Dolour (sorrow)
* Fervor (intense feeling)
* Gour (a large drinking cup, archaic)
* Honour (British English spelling)
* Lavor (a type of cloth, archaic)
* Pallor (unhealthy paleness)
* Savour (enjoy fully, British English spelling)
* Splendor (great beauty)
* Tenor (the general meaning of something)
* Treble (a high musical pitch)
* Valour (great courage)
* Vigour (strength, energy)
Please note: Some of these words are less common and may have different meanings depending on the context.