The plural

Love,

a noun - alias substantive,

indeed substantive,

in singular form,

neither feminine nor masculine,

etymologically defenceless.

In plural form

defenceless loves.

Fear,

a common noun,

at first in singular form

and then in plural:

fears.

Fears

of everything from now on.

Memory,

the first name of sorrows,

in singular form,

only in singular

and with no inflection.

The memory, the memory, the memory.

Night,

a common noun,

etymologically feminine,

in singular form.

In plural form

the nights.

The nights from now on.