This is the 391st most frequent Tamil word.
அவச
Urgency.
In this sentence, 'அவச-' is used as a root for 'அவசமாக', meaning 'quickly', showcasing an adverbial use.
அவசமாக செல்.
Go quickly.
Here, 'அவசமாக' is used as an adverb describing the manner of completion.
அவசமாக முடிந்துவிடணும்.
It should be done quickly.
In this usage, 'அவசம்' acts as a noun meaning 'haste'.