Unfortunately you don't say what 'the following' are, so can't answer the question.
The correct spelling for the plural noun of "screech" is "screeches".
No, memorys is not the correct spelling. The singular noun is memory and the plural noun is memories.
That is the correct spelling of the plural noun "lunches."
The correct spelling of the plural noun is "cultures."
That is the correct spelling of the plural noun "quays" (wharves).
The correct spelling for the plural noun of "screech" is "screeches".
The spelling of the plural noun, enrollees, is correct.
That is the correct spelling of "trainer" (an athletic coach, or animal tamer).
That is the correct spelling of the noun "colonist" (a settler, plural colonists).
The correct spelling of the plural noun is nostrils(nasal openings).
No, memorys is not the correct spelling. The singular noun is memory and the plural noun is memories.
That is the correct spelling of the plural noun fifths.
That is the correct spelling of the plural noun "lunches."
The correct spelling of the plural noun is "cultures."
That is the correct spelling of the plural noun "tenants" (renters, residents).
That is the correct spelling of "dingo" (Australian wild dog).
That is the correct spelling of "firefighter" (fireman).