Words ending in -ogue/-og

Some nouns that end with -ogue in British English end with either -og or -ogue in American English:

British US
analogue analog or analogue
catalogue catalog or catalogue
dialogue dialog or dialogue

Note that in American English, the distinctions here are somewhat fuzzy. The spelling analogue is acceptable but uncommon in American English; catalog has become the US norm, but catalogue is not uncommon; dialogue continues to be preferred over dialog.

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Grammar and usage