>Found another two missing words in English yesterday: "trudnica" (pregnant woman) and "bolesnik" (ill person).
>
>How about "genetalian", or "gravida" as a noun

You said it: as a noun. IOW, there's no such noun in English.

> and "invalid" (using a classical definition).

That's not the same. Invalid is a disabled person - check in other languages. "Bolesnik" is just a person with an illness.