exact syllable matches

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with 1 extra syllable

 
calcium dioxide
 
calcium hydroxide
 
chromium dioxide
That's
lithium dioxide
 
lithium hydroxide
 
radium hydroxide
 
sodium hydroxide

with 2 extra syllables

 
ammonium hydroxide
 
magnesium hydroxide
 
plutonium dioxide
 
potassium hydroxide
 
titanium dioxide
 
titanium dioxides
 
titanium trioxide

with 6 extra syllables

 
tetramethylammonium hydroxide