Etymology
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discolour (v.)
chiefly British English spelling of discolor (q.v.); for ending see -or. Related: Discoloured; discolouring; discolouration.
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clamour 
chiefly British English spelling of clamor (q.v.); for spelling, see -or. Related: Clamoured; clamouring; clamourous.
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glamorous (adj.)
1875, from glamour + -ous, with typical dropping of the -u- in derivatives (see -or). Related: Glamorously.
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humour 
chiefly British English spelling of humor; see -or. Related: Humourous; humourously; humourist; humourless, etc.
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guarantor (n.)
"one who binds himself that the obligation of another shall be performed," 1811, from guarantee with Latinate agent noun suffix -or substituted for -ee.
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glamorize (v.)
1901, from glamour + -ize, with typical dropping of the -u- in derivatives (see -or). Related: Glamorized; glamorizing.
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enamour (v.)
chiefly British English form of enamor, but also common in America and given preference of spelling in some American dictionaries; for spelling, see -or. Related: Enamoured.
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harbour 
chiefly British English spelling of harbor (n. and v.); for spelling, see -or. In this case it is considered to be without etymological justification and probably by analogy of labour.
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dishonour 

chiefly British English spelling of dishonor; also see -or and compare honor. Related: Dishonoured; dishonouring; dishonourable; dishonourably.

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labour 
chiefly British English spelling of labor (q.v.); for spelling, see -or. With capital L-, short for "the British Labour Party," it is attested from 1892; the party name itself is from 1886.
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