Commonality between this contiguous list of words?

Question

Whilst walking home from a long shopping trip, my friend sent me a text, which read:

Hey, Brainiac! I remember that time you won 4 spelling bee's in a row, so here's something to scratch your brain with. Try and find out what these words have in common:

• Havana

• Antidisestablishmentarianism

• Megalomaniac

• Crabapple

• Everlasting

• Grandfather

• Rockaway

• Yemen

• Neonatology

• Yarrow

• Warrior

• Realistic

• Calisthenics

I texted my friend the answer in a pretty short time, using the hints he threw at me, and disregarding the curveballs. Can you figure it out?

(P.S.: I got the idea for this here, though these are different puzzle types. Have fun.)

Answer 1

Edited to go with my first guess....

Each share the same common letter between their end and the start of the next word

This matches the title hint 'contiguous'