Denshi Jisho — Online Japanese dictionary

九 く nine
Common word, Numeric 
九 ここ nine
Numeric 
九 この nine
Numeric 
九九 くく multiplication table; times table
Common word, Noun 
九絵 くえ longtooth grouper (species of fish, Epinephelus bruneus)
Noun, Usually written using kana alone 
九々 くく multiplication table; times table
Noun 
九分 くぶ nine parts; nine percent; almost
Noun 
九 きゅう nine
Common word, Numeric 
九 ここの nine
Numeric 
九月 くがつ September
Common word, Adverbial noun 
九品 くほん 1: (Buddhist term) (Abbreviation) nine levels of Amitabha's Pure Land;
2: Amitabha's Pure Land;
3: nine-tiered lotus leaf platform in Amitabha's Pure Land
Noun 
九輪 くりん kurin (nine vertically stacked rings of a pagoda finial); pagoda finial
Noun 
九重 ここのえ ninefold; imperial palace; the Court
Common word, Noun 
九日 ここのか 1: the ninth day of the month;
2: nine days
Common word, Noun 
九つ ここのつ nine
Common word, Numeric 
九夏 きゅうか summer
Noun 
九死 きゅうし narrowly averting death
Noun 
九紫 きゅうし ninth of nine traditional astrological signs (corresponding to Mars and south)
Noun 
九地 きゅうち very low land
Noun 
九十 くじゅう ninety
Noun 
九百 くひゃく 1: 900;
2: (Archaism) (Derogatory) fool; idiot
Noun 
九六 くんろく ozeki ranked sumo wrestler unable to live up to the expectations of his rank
Noun 
九日 ここぬか 1: the ninth day of the month;
2: nine days
Out-dated or obsolete kana, Noun 
９つ ここのつ nine
Numeric 
九卿 きゅうけい 1: (Archaism) nine ministers (of the ancient Chinese government);
2: nobility
Noun 
九穀 きゅうこく the nine grains
Noun 
九星 きゅうせい nine traditional astrological signs in Onmyoudou, each corresponding to the year of a person's birth and used to create a horoscope
Noun 
九生 きゅうせい nine lives (of a cat)
Noun 

Found 84 words. Page one, two, three

You can also

Look up kanji details for 九 ここのつ.

Try a Yahoo Jisho search for 九 ここのつ .
Try a Goo Jisho search for 九 ここのつ .
Try a Google search for 九 ここのつ .