Or and OUR .
The ending our was in general use until the appearance of Webster’s Dictionary, in which the u was dropped in words terminating with our. This innovation has steadily gained ground. We do not approve of partial tinkerings with English orthography; and, until a general convention of British and American scholars settle the method of spelling English words, we shall adhere to the established usage. We append a list of words terminating in our.
arbour
ardour
armour
behaviour
candour
clamour
clangour
colour
contour
demeanour
dishonour
dolour
endeavour
favour
fervour
flavour
harbour
honour
humour
labour
neighbour
odour
parlour
rancour
rigour
rumour
savour
saviour
splendour
succour
tambour
tumour
valour
vapour
vigour
The u is dropped when the termination ous is added to any of these words; as, clamorous, dolorous, humorous, laborious, odorous, rancorous, rigorous, valorous, vigorous. And also in derivative words; such as armory, honorary, &c.