Smart a** answer

Besides all ending in the letter "y" what do the words decay, enemy, essay, excellency, expediency and ivy have in common?

Math class trivia

my thoughts - all are nouns or can all the words also be used before or after the word "common"?
Such as common enemy, common ivy

In each word one vowel is followed by two consecutive consonants.

"Common" can't be the answer; it doesn't go with all of them.

That is, in each word at least one vowel is followed by exactly two consecutive consonants. So 'ace' doesn't belong to the group but 'all' does.

DK, NME, SA, XLNC, XPDNC, IV. That was EZ!

Very clear once one knows the answer! Amazing!

"That is, in each word at least one vowel is followed by exactly two consecutive consonants." Not true of "decay," "enemy," or "ivy." I'll vote for the DK, NME, . . . , IV answer.

Whoops! 'Decay' upsets my claim.

they are all in the problem question