The answers to these questions are based on the vowels A, E, I, O, and U - not Y or W. The answers do not include the British spelling of such words as HONOR - spelled HONOUR in England.

1. What two words contain all five vowels in alphabetical order, each vowel used only once? 

2. What two-word phrase contains all five vowels in alphabetical order, each vowel used only once?

3. What seven words contain four vowels in a row?

4. What words contain all five vowels?

(Possible) Answers:

1. FACETIOUS
    ABSTEMIOUS 

2. TRADE DISCOUNT

3.  QUEUE
     KAUAI
     SIOUAN
     SEQUOIA
    AQUEOUS
    HAWAIIAN
    OBSEQUIOUS
    
4.  Surprisingly, there are hundreds of English words that contain all five vowels. Those listed below are some of the more common ones:

EDUCATION           TAMBOURINE
AUTOMOBILE        PRECARIOUS
AUTHORIZE            EVACUATION
PRECAUTION         REGULATION
DIALOGUE              EUPHORIA
DISCOURAGE         OUTPATIENT
PERSUASION           PERMUTATION
HOUSEMAID            INOCULATE
JAILHOUSE              EQUATION
NEFARIOUS              PNEUMONIA
VEXATIOUS              DELUSIONAL
BOUNDARIES           CAULIFLOWER
REPUTATION            COMMUNICATE
CONTINUANCE        SUBORDINATE
UNMOTIVATED        AMBIDEXTROUS
UNFORGIVABLE      ULTRAVIOLET
GRANDILOQUENT  HALLUCINOGENIC 

Credit:

2: Michelle Kenney and Jeff Chen