Words are just small links that con­nect big feel­ings and aspi­ra­tions that we don’t talk about out loud.

long words

So, the longest sci­en­tif­ic name is: methyl­propenylenedi­hy­drox­ycin­namemeny­lacrylic acid

the longest words

Longest nouns: mis­an­thropy and excel­len­cy

Longest ani­mate nouns: eleventh grad­er and clerk.

Longest noun with­out a hyphen: water mud peat paraf­fin treat­ment

Longest hyphen­at­ed noun: bull­doz­er loader

The longest adverb record­ed in the dic­tio­nary: unsat­is­fac­to­ry

Longest verb: to recer­ti­fy, to sub­stan­ti­ate, to inter­na­tion­al­ize

Longest adjec­tive with a hyphen: agri­cul­tur­al engi­neer­ing

Longest adjec­tive with­out a hyphen: elec­tropho­to­semi­con­duc­tor

the longest words

Word with 5 vow­els in a row: chi­huahua

Word with 7 con­so­nants in a row: counter-look, rouse, counter-encounter

Word with 9 con­so­nants in a row: counter-bring

A word that has 3 pairs of iden­ti­cal let­ters in a row: telegramap­pa­ra­tus

44 let­tersa chem­i­cal sub­stance, anoth­er name is akrikhin. Methoxy­chlorodi­ethy­laminomethyl­buity­laminoacri­dine

Longest abbre­vi­a­tion: NIIOMTPLABOPARMBETZHELBETRABSBORMONIMONKONOTDTEHSTROMONT. 56 let­ters. Expla­na­tion: Research lab­o­ra­to­ry for con­crete rein­force­ment oper­a­tions and rein­forced con­crete works for the con­struc­tion of pre­fab­ri­cat­ed mono­lith­ic and mono­lith­ic struc­tures of the tech­nol­o­gy depart­ment of the con­struc­tion and instal­la­tion depart­ment of the Acad­e­my of Con­struc­tion and Archi­tec­ture of the USSR.

Longest pho­bia name: hyp­popo­tomon­stros­esquip­peadalio­pho­bia — patho­log­i­cal fear of pro­nounc­ing long words.

And final­ly, the longest word in the Eng­lish lan­guage. It con­sists of 1913 let­ters!!! This is the chem­i­cal name, here is the for­mu­la: C1289H2051N343O375S8

Methionyl­glu­t­a­miny­larginyl­ty­ro­syl­glu­tamylserylleucylpheny­lalany­lalanyl­glu­t­a­minyl
leucylly­syl­gl utamy­larginyllysyg­lu­tamyl­gy­cy­lalanylpheny­lalanyl­va­lyl­pro­lylpheny­lalanyl­va­lylthre
onylleucyl­gl ycy­las­partyl­pro­lyl­gly­cyl­lisoleucyl­glu­tamyl­glu­t­a­minylserylleucylly­sylisoleucy­lasp
artylthre­onylleu cylisoleucyl­glu­tamy­lalanyl­gly­cy­lalany­las­party­lalanylleucyl­glu­tamylleucyl­gly­cylis
oleucyl­pro­lylph eny­lalanylsery­las­partyl­pro­lylleucy­lalany­las­partyl­gly­cyl­pro­lylthre­onylisoleucyl­gl
uta­miny­las­para giny­lalanylthre­onylleucy­larginy­lalanylpheny­lalany­lalany­lalanyl­gly­cyl­va­lylthre­ony
lpro­ly­lalanyl­gl uta­minyl­cys­teinylpheny­lalanyl­glu­tamyl­me­thionylleucy­lalanylleucylisoleucy­larginyl
glu­t­a­minyllys ylhis­tidyl­pro­lylthre­onylisoleucyl­pro­lylisoleucyl­gly­cylleucylleucyl­me­thionyl­ty­ros
ylalan­ly­las­para­gi nylleucyl­va­lylpheny­lalany­las­paraginylly­syl­gly­cylisoleucy­las­partyl­glu­tamylpheny­la
lanyl­ty­ro­sy­lal anyl­glu­t­a­minyl­cys­teinyl­glu­tamylly­syl­va­lyl­gly­cyl­va­ly­las­partyl­sryl­va­lyleucyl­va­lyl
alany­las­partylv alyl­pro­lyl­va­lyl­glu­t­a­minyl­glu­tamylsery­lalanyl­pro­lylpheny­lalany­larginyl­glu­t­a­miny­la
lany­lalanylleu cylarginyl­his­tidy­las­paraginyl­va­ly­lalanyl­pro­lylisoleucylpheny­lalanylisoleucyl­cyst
einyl­pro­lyl­pro­lyl asparty­lalany­las­party­las­party­las­partylleucylleucy­larginyl­glu­t­a­minylisoleucy­lalan
ylseryl­ty­ro­sylg lycy­larginyl­gly­cyl­ty­ro­sylthre­onyl­ty­ro­sylleucylleucylsery­larginy­lalanyl­gly­cyl­valy
lthre­onyl­gly­cy­lal anyl­glu­tamy­las­paraginy­larginy­lalany­lalanylleucylleucylly­syl­glu­tamyl­ty­ro­sy­las­para
giny­lalany­lal anyl­pro­lyl­pro­lylleucyl­glu­t­a­minyl­gly­cylpheny­lalanyl­gly­sylisoleucylsery­lalanyl­prol
ylas­partyl­glu­ta minyl­va­lylly­sy­lalany­lalanylisoleucy­las­party­lalanyl­gly­cy­lalany­lalanyl­gly­cy­lalanyl
isoleucylseryl­gl ycylsery­lalanylisoleucyl­va­lylly­sylisoleucylisoleucyl­glu­tamyl­glu­t­a­minyl­his­tidy­las
paraginylisoleuc ylglu­tamyl­pro­lyl­glu­tamylly­syl­me­thionylleucy­lalany­lalanylleucylly­syl­va­lylpheny­lal
anyl­va­lyl­glu­ta minyl­pro­lyl­me­thionylly­sy­lalany­lalanylthre­ony­larginylser­ine

After read­ing this com­po­si­tion, you under­stand that the word is human pow­er … :)))

See also
10 longest rivers