Words ending in -ogue/-og

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

analogueanalog or analogue
cataloguecatalog or catalogue
dialoguedialog 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.

See more from Are There Endings Beginning With Vowels?