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From letters K, I, T, T, E, N, I, S, H, N, E, S, S  I made following words

13 letter words

kittenishness[20]

11 letter words

kinesthesis[18]

10 letter words

inkinesses[14], thinnesses[13], ninetieths[13], tininesses[10], intestines[10]

9 letter words

kittenish[16], skinniest[13], stinkiest[13], shininess[12], ninetieth[12], einsteins[9], sensitise[9], intestine[9], tensities[9], intensest[9], sentients[9], insistent[9], testiness[9]

8 letter words

hinkiest[15], skittish[15], inkiness[12], kinetins[12], knessets[12], shinnies[11], shiniest[11], thinness[11], esthesis[11], hessites[11], hissiest[11], thinnest[11], stithies[11], einstein[8], nineties[8], sienites[8], tennises[8], tininess[8], sestines[8], entities[8], sentient[8], tinniest[8], tennists[8]

7 letter words

knishes[14], shikses[14], enskies[11], kineses[11], kinesis[11], siskins[11], kinetin[11], inkiest[11], knesset[11], kitties[11], kittens[11], heinies[10], hinnies[10], hissies[10], theines[10], hessite[10], sithens[10], theists[10], senseis[7], seisins[7], sienite[7], intense[7], tennies[7], intines[7], sestine[7], sennets[7], sennits[7], insists[7], tiniest[7], intents[7], tennist[7], tensest[7], sestets[7], tsetses[7]

6 letter words

sheiks[13], shikse[13], kithes[13], thinks[13], shtiks[13], kinins[10], skeens[10], skenes[10], skeins[10], siskin[10], kisses[10], kentes[10], skeets[10], steeks[10], skites[10], stinks[10], kitten[10], heinie[9], sheens[9], sneesh[9], shines[9], hisses[9], theine[9], theins[9], ninths[9], sheets[9], theses[9], heists[9], shiest[9], thesis[9], shists[9], theist[9], tithes[9], tenths[9], seines[6], sensei[6], niseis[6], seisin[6], seises[6], isseis[6], nesses[6], senses[6], intine[6], seniti[6], sennet[6], sennit[6], tennis[6], tenses[6], insets[6], steins[6], insist[6], tentie[6], intent[6], tenets[6], sitten[6], sestet[6], testes[6], tsetse[6], testis[6], stents[6], stints[6]

5 letter words

hikes[12], sheik[12], knish[12], kithe[12], think[12], khets[12], kiths[12], shtik[12], kinin[9], keens[9], knees[9], skeen[9], skene[9], kines[9], skein[9], seeks[9], skees[9], sikes[9], skies[9], sinks[9], skins[9], kente[9], keets[9], skeet[9], steek[9], kites[9], skite[9], tikes[9], tikis[9], sheen[8], shine[8], shies[8], shins[8], sinhs[8], thein[8], thine[8], ninth[8], sheet[8], these[8], heist[8], hents[8], shent[8], thens[8], seine[5], nisei[5], nenes[5], nines[5], seise[5], issei[5], esnes[5], sense[5], sines[5], esses[5], sises[5], sente[5], teens[5], tense[5], inset[5], neist[5], nites[5], senti[5], stein[5]