The question is asking about the names of organic functions, in special when an hydrocarbon has double bonds in its structure.
When a hydrocarbon doesn't have double or triple bonds, we use the suffix -ane for it (an alkane).
On the other side, when the hydrocarbon presents double bonds, we use the suffix -ene (an alkene).
And at last, when the hydrocarbon presents triple bonds in its structure, we use the suffix -yne (an alkyne).
Therefore, for this question, a molecule with one or more double bonds is called alkene.