Sanskrit - 2

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shatruntapa = shatrum + tapa

tapa means "heat" or in this case "pain".

shatruntapa = one who gives pain to the enemy

The transliteration using ITRANS scheme is "shatruntapa".

It is one of those cases where the kAraka is not dropped when making a samAsa. Here the word shatru is in dvitIyA vibhakti (karma kAraka) singular number, as "shatrum". In making conjuncts or samAsa of two words, the kAraka vibhakti of the first word is normally dropped, so "shatrum" should become just "shatru" after samAsa, i.e. the samAsita word should have been "sahtrutapa". But in this case the vibhakti is kept by exception. And following rules of sandhi, "m" of the vibhakti becomes "n".

similar to:
parantapa = param + tapa (used in GitA by sri krishna)

P.S. Recall that in sanskrit there are two ways of joining words:

1. sandhi - a euphonic conjunction between a preceding word and a following word.

e.g. prati + eka = pratyeka

2. samAasa - taking two words and joining them together by dropping the vibhakti from the first word (plus some other rules). Joining of words after dropping of vibhaktis must still follow rules of sandhi.

e.g. "rAmasya + ayanam" ->(drop vibhakti)-> "rAma + ayanam" ->(do sandhi)-> "rAmAyaNam"

In the above, after dropping the vibhakti "sya", the sandhi changes a+a to "A" and "n" to "N" due to presence of "r".