Which is longest word in english

Floccinaucinihilipipification – 29 letters

Supercalifragilisticeplalidocious – 34 letter

Hepaticocholecystostcholecystenterostomy – 40 letters

Honorificabilitudinita – 27 letters

raetertranssubstantiationalistically – 37 letters

Aequeosalinocalcalinoceraceoaluminoscupreovitriolic - 52 letters

Antidisestablishmentarianism – 28 letters