lip
DAY
A Swiss peak that is 3 letters long and begins with the letter A is the Matterhorn.
the answer is can
Ada
Ada, Oklahoma.
onion
entitlement
It should be "who." Check your assumptions regarding the letter "a".
Arc
Toe
That would be Theodore Rex (1996) starring Whoopi Goldberg.
The word has four letters. All except "a" are consonants, or 3 out of 4. That means that 3/4 of the letters in that word are consonants.