What is the Italian 'nova' in English?
New is an English equivalent of 'nova' in its use as an adjective. It's the feminine form of an adjective whose masculine form is 'novo'. Both forms are pronounced 'NOH-vah' and 'NOH-voh', respectively.
Star is an equivalent in the use of 'nova' as a noun. It's a feminine gender noun that takes as its definite article 'la' ['the'] and as its indefinite article 'una' ['a, one']. It's pronounced in the same way as the adjective above.