shadowinesses
shallownesses
shamelessness
shapelessness
shapelinesses
sharecroppers
sharecropping
sharpshooters
sharpshooting
sheepherdings
sheepshearers
sheepshearing
shellcrackers
shepherdesses
shiftlessness
shipbuildings
shortchangers
shortchanging
shuffleboards
shuttlecocked
Editorialized and effectiveness are 13 letter words. They begin with the letter e.
13-letter words that start with W include: wheelbarrowed, whitewashings...
Some 13 letter words that start with the letter a:abbreviationsabnormalitiesacceptabilityaccessibilityaccommodationaccreditationacquaintancesacupuncturistadministratoradmissibilityadvertisementaffordabilityalgebraicallyalternativelyanniversariesannouncementsanticipationsapplicabilityappropriationapproximationarchitecturalassassinationassignabilityastonishinglyattainabilityattentivenessauthenticallyauthoritativeauthorization
I had to spend some time researching this question, so you owe me one! Here are three 13 letter words that do not have the 'a' vowel in them: disinhibiting, degenerescent, and efferescence.
conflagration, incandescence, scintillation
international
Excommunicate is a 13 letter word. It begins and ends with the letter e.
advertisementaccompanimentacupuncturistapportionment
Senselessness
oystercatcher
Boardinghouse and brainstorming are 13 letter words. The 3rd letter is the letter a.
Presbyterians