Tamil has many instances of adjectives and adverbs that sound alike. Often they appear to come from the same root word, when in reality they are derived from separate noun and verb forms.
உன் நிலையில் இளைப்பாற வருவேன் கண்ணே
உள்ளே நிலைக்கும்
The two lines above, from different sections of the song, contain a form of the word நிலை. In the first line it is used as an adjective and is derived from the noun நிலை. The second line uses the verb form derived from நிலைத்தல். Although the noun and verb form sound similar their meanings are often quite different.
Definitions
இளைப்பாற - to relaxநிலையில் - from the noun நிலை which has multiple definitions including நேரம்;time, இடம்;place, நிச்சையம்;certainity
நிலைக்கும் - from the verb நிலைத்தல் meaning தங்கி விடுதல்; to settle, stay, நிலைபெருதல்; to get to certain level.
கருவிழி - iris