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There are 14 words ending with IONTH

BILLIONTH	• billionth adj. The ordinal form of the number one billion. • billionth n. The person or thing in the billionth position. • billionth n. One of a billion equal parts of a whole.
JILLIONTH	• jillionth adj. The ordinal form of the number jillion. • JILLIONTH adj. the ordinal of jillion.
MILLIONTH	• millionth adj. The ordinal form of the number one million. • millionth n. The person or thing in the millionth position. • millionth n. One of a million equal parts of a whole. Term ppm (parts per million) is also used.
ZILLIONTH	• zillionth adj. (Informal) The ordinal form of the number zillion. • zillionth n. (Informal) The person or thing in the zillionth position. • zillionth n. (Informal) One of a zillion equal parts of a whole.
TRILLIONTH	• trillionth adj. The ordinal form of the number one trillion. • trillionth n. The person or thing in the trillionth position. • trillionth n. One of a trillion equal parts of a whole.
DECILLIONTH	• decillionth adj. The ordinal form of the number decillion. • decillionth n. The person or thing in the decillionth position. • decillionth n. One of a decillion equal parts of a whole.
GAZILLIONTH	• gazillionth adj. (Informal) The ordinal form of the number gazillion. • gazillionth n. (Informal) The person or thing in the gazillionth position. • gazillionth n. (Informal) One of a gazillion equal parts of a whole.
NONILLIONTH	• nonillionth adj. The ordinal form of the number nonillion. • nonillionth n. The person or thing in the nonillionth position. • nonillionth n. One of a nonillion equal parts of a whole.
OCTILLIONTH	• octillionth adj. The ordinal form of the number octillion. • octillionth n. The person or thing in the octillionth position. • octillionth n. One of an octillion equal parts of a whole.
CENTILLIONTH	• centillionth adj. The ordinal form of the number one centillion (10³⁰³ short scale, or 10⁶⁰⁰ long scale). • centillionth n. The person or thing in the centillionth position. • centillionth n. One of a centillion equal parts of a whole.
SEPTILLIONTH	• septillionth adj. The ordinal form of the number septillion. • septillionth n. The person or thing in the septillionth position. • septillionth n. One of a septillion equal parts of a whole.
SEXTILLIONTH	• sextillionth adj. The ordinal form of the number one sextillion. • sextillionth n. The person or thing in the sextillionth position. • sextillionth n. One of a sextillion equal parts of a whole.
QUADRILLIONTH	• quadrillionth adj. The ordinal form of the number one quadrillion. • quadrillionth n. The person or thing in the quadrillionth position. • quadrillionth n. One of a quadrillion equal parts of a whole.
QUINTILLIONTH	• quintillionth adj. The ordinal form of the number one quintillion. • quintillionth n. The person or thing in the quintillionth position. • quintillionth n. One of a quintillion equal parts of a whole.

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 WikWik.org and 1Word.ws.

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English Wiktionary: 22 words
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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