tausend
thousand
The cardinal number 1000.
Für das neue Auto hat er zehntausend Euro bezahlt.
He paid ten thousand euros for the new car.

thousand
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thousand
The cardinal number 1000.
Für das neue Auto hat er zehntausend Euro bezahlt.
He paid ten thousand euros for the new car.

The number 1000 is normally written simply as 'tausend' (thousand). The form 'eintausend' (one thousand) is only used when special precision is required, for example on a check or in a contract.
Das Konzert hatte mehr als tausend Besucher.
The concert had more than a thousand visitors.
As a number word, 'tausend' (thousand) is written in lowercase. Only when it is used as a noun for an indefinite, large quantity ('Tausende von Menschen' — thousands of people) is it capitalized.
Das Buch hat über tausend Seiten.
The book has over a thousand pages.
In colloquial language, 'tausend' (thousand) is often used as an exaggeration for 'very often' or 'a lot.' Fixed phrases include 'tausend Mal' (a thousand times) or 'tausend Dank' (many thanks / a thousand thanks).
Vielen Dank für deine Hilfe, tausend Dank!
Thank you very much for your help, a thousand thanks!
much / a lot
'viel' and 'tausend' can both express that there is a large amount. 'viel' is neutral and imprecise; you use it when the exact amount is not important. 'tausend' is actually the exact number 1000. In everyday language, however, it is often used as an exaggeration to mean 'very, very many'. In that case, it is stronger and more emotional than 'viel'. If you want to stay factual, 'viel' is more natural. If you want to emphasize or exaggerate, 'tausend' often works well.

Am Telefon erzählt meine Freundin tausend Sachen über ihren neuen Job.
On the phone, my friend tells me a thousand things about her new job.
Zu Hause wartet heute viel Arbeit auf meine Schwester.
At home, a lot of work is waiting for my sister today.