Sum Word

Following is a problem really interesting..... lets see if it wacks your brain or not...( mite not... if you are too good!!)


N O S I E R
A S T R A L
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7 2 5 6 1 3

there has to be a '+' sign in between that is N O S I E R is being added to A S T R A L
I have removed it as it was causing problems , the letters were not coimng in stright lines i.e. A below N ; S below O ; so on and similarly 7 being the sum of N and A etc..
NOSIER and ASTRAL both denote individual numbers ( ie some lakhs) where each letter stands fro some digit

In the additon above, the sum represents a word.
1) Each letter represents a different digit.
2) No letter represents zero.

Which word is represented by : ' 7 2 5 6 1 3 ' ?