neunzig
ninety
The cardinal number 90, which comes between eighty-nine and ninety-one.
Der Zug fährt mit einer Geschwindigkeit von neunzig Kilometern pro Stunde.
The train is traveling at a speed of ninety kilometers per hour.

ninety
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ninety
The cardinal number 90, which comes between eighty-nine and ninety-one.
Der Zug fährt mit einer Geschwindigkeit von neunzig Kilometern pro Stunde.
The train is traveling at a speed of ninety kilometers per hour.

The ending '-zig' is used in German to form the tens numbers from 20 to 90. 'Neunzig' (ninety) follows this pattern and means 'nine times ten'.
Meine Großmutter wird bald neunzig Jahre alt.
My grandmother will soon be ninety years old.
To describe someone's decade of life, you say 'in den Neunzigern sein' (to be in one's nineties). To refer to the decade from 1990 to 1999, people say 'die Neunziger' (the nineties) or 'die neunziger Jahre' (the nineties).
Mein Großvater ist schon in den Neunzigern.
My grandfather is already in his nineties.
Although 'neunzig' (ninety) is a number, it can be used like a noun for a bus route, a room number, or a jersey number. In this case, it is capitalized.
Die Buslinie Neunzig fährt direkt zum Bahnhof.
Bus route Ninety goes directly to the train station.
nine
'neun' and 'neunzig' are both numbers and sound similar at the beginning. But the difference is big: 'neun' means 9, while 'neunzig' means 90. Learners may confuse the words because 'neunzig' starts with 'neun'. Pay special attention to the ending '-zig'. It turns a one-digit number into a tens number. In prices, quantities, and times, this confusion can quickly lead to a completely different meaning.

Der Schrank kostet heute nur neunzig Euro.
The cabinet costs only ninety euros today.
Für den Kuchen brauchen wir neun Eier.
We need nine eggs for the cake.