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There are 12 ten-letter words beginning with SPER

SPERMACETI	• spermaceti n. A wax obtained from the head of sperm whales and used to make cosmetics etc. • SPERMACETI n. a waxlike substance used in candles, ointments, etc., obtained from oil of sperm-whale, etc., also PARMACITIE.
SPERMADUCT	• spermaduct n. A spermatic duct. • SPERMADUCT n. a duct conveying spermatozoa, also SPERMIDUCT.
SPERMARIES	• spermaries n. Plural of spermary. • SPERMARY n. an organ in which sperm is formed.
SPERMARIUM	• SPERMARIUM n. the male germ gland, also SPERMARY.
SPERMATIAL	• spermatial adj. Of or relating to the spermatium. • SPERMATIAL adj. of or like a spermatium, one of the motionless spermatozoids in the conceptacles of certain fungi.
SPERMATICS	• spermatics n. Plural of spermatic. • SPERMATIC n. a spermatic vessel.
SPERMATIDS	• spermatids n. Plural of spermatid. • SPERMATID n. a cell that develops directly into a spermatozoon.
SPERMATIUM	• spermatium n. One of the motionless spermatozoids in the conceptacles of certain fungi. • SPERMATIUM n. one of the motionless spermatozoids in the conceptacles of certain fungi.
SPERMICIDE	• spermicide n. A substance used for killing sperm. • SPERMICIDE n. a substance that kills sperm.
SPERMIDUCT	• spermiduct n. Synonym of vas deferens. • SPERMIDUCT n. a duct conveying spermatozoa, also SPERMADUCT.
SPERMOGONE	• SPERMOGONE n. a flask-shaped structure in some fungi, also SPERMOGONIUM.
SPERRYLITE	• sperrylite n. (Mineralogy) An isometric-diploidal tin white mineral containing arsenic and platinum. • SPERRYLITE n. an arsenide of platinum, the only known compound of platinum occurring in nature.

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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English Wiktionary: 39 words
Scrabble in French: 4 words
Scrabble in Spanish: no word
Scrabble in Italian: 108 words
Scrabble in German: no word
Scrabble in Romanian: 45 words

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