reservoir.

[Mark Odegard]

Lots of us recognize syllable-end ~oir as requiring the 'wah', 'wahr'
pronunciation, not so much as faux French, but as a real English rule. There
are not too many words with this, but voir dire, boudoir, film noir, savoir
faire, memoir, and avoirdupois come to mind.

For myself, I wobble between a Frencified form and reservore.
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