[identity profile] randomchris.livejournal.com 2009-06-12 03:16 pm (UTC)(link)
One describes a person, the other an action (first and second respectively).

[identity profile] bohemiancoast.livejournal.com 2009-06-12 03:30 pm (UTC)(link)
Treasonable acts, treasonous behaviour. I am not sure about people. I think they may be treasoners.

[identity profile] henriksdal.livejournal.com 2009-06-12 03:34 pm (UTC)(link)
or traitors? I had no idea about the difference bewtween treasonable and treasonous. I spent way too long today wondering why it was Surveyor and not Surveyer. anyone?

[identity profile] bracknellexile.livejournal.com 2009-06-12 03:36 pm (UTC)(link)
Same reason it's Inspector and not Inspecter, obviously :)

(in other words, I have no idea!)

[identity profile] swisstone.livejournal.com 2009-06-12 04:14 pm (UTC)(link)
The -er suffix to denote an agent derives from Old English, whilst -or comes from Latin via French. 'Survey' is a borrowing from French, so naturally attracts the French form.

[identity profile] cybik.livejournal.com 2009-06-12 04:21 pm (UTC)(link)
You have my brother's email address, right? ;)

[identity profile] swisstone.livejournal.com 2009-06-12 04:01 pm (UTC)(link)
The OED says 'treasonists'. There's no entry for 'treasoner'.

[identity profile] swisstone.livejournal.com 2009-06-12 03:59 pm (UTC)(link)
Yes.

A quick scan of the OED suggests that the terms are mutually interchangeable. They both exist because there is more than one way of forming adjectives. Evidently in this case neither has been able to fully drive the other out of use (though I'd reckon 'treasonous' is winning at the moment).

It may be that the two adjectives are formed from different words. The Latin derived -ous suffix is principally (though not exclusively) a means of adjectivizing nouns, whilst the French derived -able adjectivizes verbs. There is a verb 'treason', though it's rare now, and perhaps that explains the existence of 'treasonable'. However, the OED says its derived from the noun. There is also 'treasonful', which again doesn't seem to have a significant difference in meaning from the others.

[identity profile] swisstone.livejournal.com 2009-06-12 04:10 pm (UTC)(link)
'Treasonable' seems to be the slightly more antique formation, but only by about a hundred years or so (fourteenth century vs. fifteenth).

[identity profile] cheekbones3.livejournal.com 2009-06-12 08:36 pm (UTC)(link)
Noo!

[identity profile] missedith01.livejournal.com 2009-06-12 09:29 pm (UTC)(link)
I wouldn't say treasonous, I think I'd want to say treacherous.