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There are 7 thirteen-letter words beginning with SEI

SEIGNIORSHIPSseigniorships n. Plural of seigniorship.
SEIGNIORSHIP n. the office of seignior.
SEISMOGRAPHERseismographer n. A person who measures and records earthquakes and other ground vibrations.
seismographer n. A person who studies such records, a seismologist.
SEISMOGRAPHER n. one who uses a seismograph.
SEISMOGRAPHICseismographic adj. Relating to seismography and seismology.
SEISMOGRAPHIC adj. relating to seismography, also SEISMOGRAPHICAL.
SEISMOLOGICALseismological adj. Relating to seismology.
SEISMOLOGICAL adj. related to seismology, also SEISMOLOGIC.
SEISMOLOGISTSseismologists n. Plural of seismologist.
SEISMOLOGIST n. one who studies earthquakes.
SEISMOMETRIESSEISMOMETRY n. the scientific study of earthquakes.
SEISMONASTIESSEISMONASTY n. response to mechanical shock.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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