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From letters B, I, O, M, A, T, H, E, M, A, T, I, C, S  I made following words

14 letter words

biomathematics[25]

11 letter words

mathematics[20], metasomatic[17]

10 letter words

biochemist[19], mathematic[19], hemostatic[17]

9 letter words

hecatombs[18], ischaemia[16], haematics[16], isobathic[16], bioethics[16], hematomas[16], hematitic[16], bitchiest[16], asthmatic[16], thematics[16], botchiest[16], chemostat[16], miasmatic[15], stemmatic[15], atheistic[14], timothies[14], catamites[13], masticate[13], steamboat[13], atomistic[13]

8 letter words

memsahib[17], chammies[17], machismo[17], machoism[17], hecatomb[17], mismatch[17], ischemia[15], bohemias[15], obeahism[15], isocheim[15], isochime[15], haematic[15], bioethic[15], hematoma[15], schemata[15], hematics[15], mastiche[15], misteach[15], tachisme[15], hammiest[15], cohabits[15], biotechs[15], moschate[15], bathetic[15], thematic[15], bathmats[15], schmatte[15], semicoma[14], achiotes[13], attaches[13], habitats[13], tachiste[13], chitties[13], ethicist[13], itchiest[13], theistic[13], hemostat[13], mothiest[13], meticais[12], imamates[12], iceboats[12], iotacism[12], comities[12], semiotic[12], catamite[12], amitotic[12], tabetics[12], atticism[12], mastitic[12], stemmata[12], semimatt[12], catboats[12], biscotti[12], stomatic[12], totemism[12], imitates[10], biotites[10], osteitic[10]

7 letter words

chemism[16], cambism[15], bohemia[14], chamisa[14], chiasma[14], beamish[14], chamise[14], chiasmi[14], maihems[14], chamiso[14], chamois[14], echoism[14], hematic[14], cohabit[14], biotech[14], batches[14], bitches[14], matches[14], tachism[14], chemist[14], isthmic[14], botches[14], stomach[14], bathmat[14], amoebic[13], ambsace[13], iambics[13], cammies[13], miasmic[13], mamboes[13], commies[13], mimetic[13], commata[13], tambacs[13], cambist[13], combats[13], tombacs[13], commits[13], himatia[12], achiote[12], achiest[12], aitches[12], bhistie[12], hamates[12], atheism[12], isobath[12], isotach[12], bothies[12], homiest[12], attache[12], habitat[12], cattish[12], tachist[12], shittim[12], camisia[11], amoebas[11], caeomas[11], abomasi[11], imamate[11], iceboat[11], abiotic[11], comitia[11], meiotic[11], basmati[11], sematic[11], miscite[11], mismate[11], semimat[11], tammies[11], mistime[11], biotics[11], comates[11], atomics[11], osmatic[11], somatic[11], miotics[11], somitic[11], atomism[11], tommies[11], tabetic[11], titmice[11], catboat[11], totemic[11], mitotic[11], tomcats[11], hastate[10], atheist[10], staithe[10], hotties[10], amities[9], amosite[9], atomies[9], atomise[9], imitate[9], biotite[9], abattis[9], astatic[9], batiste[9], bistate[9], catties[9], statice[9], tatamis[9], etatism[9], matiest[9], mitiest[9], costate[9], scottie[9], stomata[9], stomate[9], atomist[9], satiate[7]

6 letter words

haemic[13], cambia[12], amebic[12], iambic[12], cammie[12]