Turquoise is a feminine noun and adjective in French. It has no masculine.
It is a French noun, so it is the same, "turquoise".
Un rubis is a masculine noun in French.
In French, "apricot" (abricot) is a masculine noun.
"le café" is a masculine noun in French.
devoir (noun) is a masculine word in French.
Yes, "hippopotame" is a masculine noun in French.
A book is 'un livre' (masculine noun) in French.
Masculine: un lycée / le lycée
masculine
Un sandwich is a masculine noun in French.
Le Portugal is a masculine noun in French.
Un fauteuil is a masculine noun in French.