Lamby:

Sequoia has all five vowels in a seven letter word.

Facetious has them in alphabetical order.

I'm told meaiou is an alternative spelling to meow, but I don't believe it.

As for consonants, hmm. How about syllables? I know a word with one syllable that has eight letters in it. It's a noun, so adding "s" will make it a nine letter word with one syllable.

That ten bird stuff further down sounds ridiculous. They're all pronounced the same. Ten is ten. A real tongue twister can make you talk funny.

The sixth sick sheikh's sixth sheep's sick.