"grand-" means "big". "grandiose" and "grandeur" have different meanings. So I would like to know what their suffixes "-iose" and "-eur" mean respectively?
closed as off-topic by mplungjan, Kris, Andrew Leach♦, Rory Alsop, MrHen Dec 19 '13 at 14:01
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-eur is not really an English suffix; I believe it occurs only in loanwords from French. French has two suffixes -eur; the relevant one forms feminine nouns meaning "the property of being ___" from adjectives meaning "___", such as grandeur ("the property of being grand, big") and froideur ("the property of being froid, cold"). (The other one forms masculine agent nouns, such as empereur = "emperor", acteur = "actor"; that's the one found in English borrowings like voyeur and connoisseur (though in French the latter is now spelled connaisseur).)
-ose is not very common in English, either, but it's a bit less restricted; it's found in otiose, bellicose, morose, adipose, and so on, and it's basically just an adjective ending like -ous. (There's also another sense of -ose, which is more of an English suffix, and forms names of sugars: sucrose, glucose, dextrose, lactose, and so on.)