Word  Clue 

billion  the number that is represented as a one followed by 9 zeros 

billionth  position 1,000,000,000 in a countable series of things 

brace  two items of the same kind 

couple  two items of the same kind 

couplet  two items of the same kind 

duet  two items of the same kind 

dyad  two items of the same kind 

eight  the cardinal number that is the sum of seven and one 

eighteen  the cardinal number that is the sum of seventeen and one 

eighteenth  position 18 in a countable series of things 

eighth  position eight in a countable series of things 

eighty  the cardinal number that is the product of ten and eight 

eleven  the cardinal number that is the sum of ten and one 

eleventh  position 11 in a countable series of things 

fifteen  the cardinal number that is the sum of fourteen and one 

fifteenth  position 15 in a countable series of things 

fifty  the cardinal number that is the product of ten and five 

five  the cardinal number that is the sum of four and one 

forty  the cardinal number that is the product of ten and four 

four  the cardinal number that is the sum of three and one 

foursome  the cardinal number that is the sum of three and one 

fourteen  the cardinal number that is the sum of thirteen and one 

fourteenth  position 14 in a countable series of things 

fourth  following the third position; number four in a countable series 

gross  twelve dozen 

hundred  ten 10s 

hundredth  position 100 in a countable series of things 

leash  the cardinal number that is the sum of one and one and one 

million  the number that is represented as a one followed by 6 zeros 

millionth  position 1,000,000 in a countable series of things 

nine  the cardinal number that is the sum of eight and one 

niner  the cardinal number that is the sum of eight and one 

nineteen  the cardinal number that is the sum of eighteen and one 

nineteenth  position 19 in a countable series of things 

ninety  the cardinal number that is the product of ten and nine 

pair  two items of the same kind 

Phoebe  the cardinal number that is the sum of four and one 

quartet  the cardinal number that is the sum of three and one 

quint  the cardinal number that is the sum of four and one 

quintet  the cardinal number that is the sum of four and one 

seven  the cardinal number that is the sum of six and one 

seventeen  the cardinal number that is the sum of sixteen and one 

seventeenth  position 17 in a countable series of things 

seventh  position seven in a countable series of things 

seventy  the cardinal number that is the product of ten and seven 

singleton  a single object (as distinguished from a pair) 

sixer  the cardinal number that is the sum of five and one 

sixteen  the cardinal number that is the sum of fifteen and one 

sixteenth  position 16 in a countable series of things 

sixth  position six in a countable series of things 

sixty  the cardinal number that is the product of ten and six 

span  two items of the same kind 

teens  all the numbers that end in teen 

tenth  position ten in a countable series of things 

thirteen  the cardinal number that is the sum of twelve and one 

thirteenth  position 13 in a countable series of things 

thirty  the cardinal number that is the product of ten and three 

thousand  the cardinal number that is the product of 10 and 100 

thousandth  position 1,000 in a countable series of things 

three  the cardinal number that is the sum of one and one and one 

threesome  the cardinal number that is the sum of one and one and one 

trey  the cardinal number that is the sum of one and one and one 

triad  the cardinal number that is the sum of one and one and one 

trine  the cardinal number that is the sum of one and one and one 

trinity  the cardinal number that is the sum of one and one and one 

trio  the cardinal number that is the sum of one and one and one 

twain  two items of the same kind 

twelfth  position 12 in a countable series of things 

twelve  the cardinal number that is the sum of eleven and one 

twentieth  position 20 in a countable series of things 

twenty  the cardinal number that is the sum of nineteen and one 

twosome  two items of the same kind 

VIII  the cardinal number that is the sum of seven and one 

yoke  two items of the same kind 

 
