Word play

...a common seven-letter word containing none of a, e, i, o or u

...a word with nine letters, eight of which are consonants

...a word containing the letter sequence UEUEI

...the three letters which can be added, in the same order, to the beginning and end of ERGRO to make a common word

...a word which contains the letter sequence GNT

...a common word of only seven letters containing all five vowels - a, e, i, o and u (in any order)

...a twelve-letter American word (with hypen) that can be typed using only one row of the keyboard

...a word with eight letters containing a, b, c, d, e and f

...a word which contains the letter sequence UFA (other than the mineral tufa)

...a twelve-letter word containing only four consonants

...a 16-letter word containing no vowels other than E

...the longest word in the Oxford English Dictionary not to contain the letter E

...a country of 18 letters which alternate vowels and consonants (not necessarily all in one word)

...the place with the longest name in the world. (If you're thinking "how am I ever going to type that in?" then you're thinking of the wrong place.)

Finally: find a very common French word made up of the five vowels and a single 's'.