Dictionary Completion of Capitalized Words

Typing part of a word, then using Ctrl-X Ctrl-K to complete the word
from entries in a dictionary works fine as long as the word (not
a proper noun) is all lower case. But when a word that is lower
case in the dictionary is capitalized when typed, as at the start of
a sentence or in a title, completion from the dictionary fails.

Is there a way to have Ctrl-X Ctrl-K complete a capitalized word
even though it is not capitalized in the dictionary?

Example:

cornu<C-X><C-K> expands to cornucopia (or cornucopias), but
Cornu<C-X><C-K> results in E486 Pattern not found.

I'm using Vim 8.2.4127 in a terminal on Linux.

Regards,
Gary

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